Dr Yimao Wan

Research Fellow
+61 2 6125 1250

Dr Yimao Wan is a Research Fellow at the Research School of Engineering at the Australian National University since 2014. He has over 13 years’ experience as a scientific researcher and project manager in semiconductor and photovoltaics. He obtained a PhD from the ANU in 2014, with a thesis on surface passivating materials for high efficiency silicon solar cells. After the pursue of bachelor degree from the School of Electrical and Electronic Engineering at Nanyang Technology University in 2004, he worked six years in semiconductor industries for process research and development. His current research interests are in silicon solar cells, silicon/perovskite tandem solar cells, solar-driven water splitting, and silicon-based battery. 

Functionalised nanomaterials 

Silicon solar cells

Silicon/perovskite tandem solar cells

Solar-driven water splitting

Silicon-based battery. 

Since commencement of PhD in 2010, I have published 36 refereed journal articles, and 19 conference papers. Those most directly related to the project are indicated with an asterisk. Publications are listed in reverse chronological order. Impact factors (IF) is as quoted in the Journal Citation Reports 2016.

Refereed journal articles

1.              *J Peng, Y Wu, Y Wang, D Jacobs, H Shen, X Fu, Y. Wan, T Doung, N Wu, C Barugkin, H Nguyen, D Zhong, J Li, T Lu, Y Liu, M Lockrey, K Weber, K Catchpole, T White, "Interface passivation using ultrathin polymer-fullerene films for high-efficiency perovskite solar cells with negligible hysteresis," Energy & Environmental Science,  2017. 

2.              *J. Tong, Y. Wan, J. Cui, S. Lim, N. Song, and A. Lennon, "Solution-processed Molybdenum Oxide for Hole-selective Contacts on Crystalline Silicon Solar Cells," Applied Surface Science, 2017. 

3.              *J. Cui, Y. Wan, Y. Cui, Y. Chen, P. Verlinden, and A. Cuevas, "Highly effective electronic passivation of silicon surfaces by atomic layer deposited hafnium oxide," Applied Physics Letters, vol. 110, p. 021602, 2017.

4.              *T. G. Allen, J. Bullock, Q. Jeangros, C. Samundsett, Y. Wan, J. Cui, A. Hessler-Wyser, S. De Wolf, A. Javey, and A. Cuevas, "A Low Resistance Calcium/Reduced Titania Passivated Contact for High Efficiency Crystalline Silicon Solar Cells," Advanced Energy Materials, pp. 1602606-n/a, 2017.

5.              *Y. Wan, C. Samundsett, J. Bullock, M. Hettick, T. Allen, D. Yan, et al., "Conductive and Stable Magnesium Oxide Electron-Selective Contacts for Efficient Silicon Solar Cells," Advanced Energy Materials, pp. 1601863-n/a, 2016.

6.              *Y. Wan, C. Samundsett, J. Bullock, T. Allen, M. Hettick, D. Yan, P. Zheng, X. Zhang, J. Cui, J. McKeon, A. Javey, and A. Cuevas, "Magnesium Fluoride Electron-Selective Contacts for Crystalline Silicon Solar Cells," ACS Applied Materials & Interfaces, vol. 8, pp. 14671-14677, 2016/06/15 2016.

7.              *Y. Wan, C. Samundsett, D. Yan, T. Allen, J. Peng, J. Cui, X. Zhang, J. Bullock, and A. Cuevas, "A magnesium/amorphous silicon passivating contact for n-type crystalline silicon solar cells," Applied Physics Letters, vol. 109, p. 113901, 2016.

8.              *J. Peng, T. Duong, X. Zhou, H. Shen, Y. Wu, H. K. Mulmudi, Y. Wan, D. Zhong, J. Li, T. Tsuzuki, K. J. Weber, K. R. Catchpole, and T. P. White, "Efficient Indium-Doped TiOx Electron Transport Layers for High-Performance Perovskite Solar Cells and Perovskite-Silicon Tandems," Advanced Energy Materials, pp. 1601768-n/a, 2016. 

9.              *T. G. Allen, J. Bullock, P. Zheng, B. Vaughan, M. Barr, Y. Wan, C. Samundsett, D. Walter, A. Javey and A. Cuevas, "Calcium contacts to n-type crystalline silicon solar cells," Progress in Photovoltaics: Research and Applications, 2016.

10.          *X. Zhang, Y. Wan, J. Bullock, T. Allen, and A. Cuevas, "Low resistance Ohmic contact to p-type crystalline silicon via nitrogen-doped copper oxide films," Applied Physics Letters, vol. 109, p. 052102, 2016. 

11.          *P. Zheng, F. Rougieux, C. Samundsett, X. Yang, Y. Wan, J. Degoulange, R. Einhaus, P. Rivat, and D. Macdonald, "Upgraded metallurgical-grade silicon solar cells with efficiency above 20%," Applied Physics Letters, vol. 108, p. 122103, 2016.

12.          *D. Yan, A. Cuevas, Y. Wan, and J. Bullock, "Passivating contacts for silicon solar cells based on boron-diffused recrystallized amorphous silicon and thin dielectric interlayers," Solar Energy Materials and Solar Cells, vol. 152, pp. 73-79, 2016. 

13.          H. T. Nguyen, F. E. Rougieux, D. Yan, Y. Wan, S. Mokkapati, S. M. De Nicolas, J. P. Seif, S. De Wolf, and D. Macdonald, "Characterizing amorphous silicon, silicon nitride, and diffused layers in crystalline silicon solar cells using micro-photoluminescence spectroscopy," Solar Energy Materials and Solar Cells, vol. 145, pp. 403-411, 2016. 

14.          Z. Lu, Z. Ouyang, N. Grant, Y. Wan, D. Yan, and A. Lennon, "Manipulation of stored charge in anodic aluminium oxide/SiO2 dielectric stacks by the use of pulsed anodisation," Applied Surface Science, vol. 363, pp. 296-302, 2016.

15.          J. Cui, T. Allen, Y. Wan, J. Mckeon, C. Samundsett, D. Yan, X. Zhang, Y. Cui, Y. Chen, and P. Verlinden, "Titanium oxide: A re-emerging optical and passivating material for silicon solar cells," Solar Energy Materials and Solar Cells, 2016.

16.          *J. Bullock, P. Zheng, Q. Jeangros, M. Tosun, M. Hettick, C. M. Sutter‐Fella, Y. Wan, T. Allen, D. Yan, D. Macdonald, S. De Wolf, A. Hessler-Wyser, A. Cuevas, and A. Javey "Lithium Fluoride Based Electron Contacts for High Efficiency n-Type Crystalline Silicon Solar Cells," Advanced Energy Materials, 2016. 

17.          T. G. Allen, Y. Wan, and A. Cuevas, "Silicon Surface Passivation by Gallium Oxide Capped With Silicon Nitride," IEEE Journal of Photovoltaic, 2016. 

18.          *D. Yan, A. Cuevas, Y. Wan, and J. Bullock, "Silicon nitride/silicon oxide interlayers for solar cell passivating contacts based on PECVD amorphous silicon," physica status solidi (RRL)-Rapid Research Letters, vol. 9, pp. 617-621, 2015. 

19.          *D. Yan, A. Cuevas, J. Bullock, Y. Wan, and C. Samundsett, "Phosphorus-diffused polysilicon contacts for solar cells," Solar Energy Materials and Solar Cells, vol. 142, pp. 75-82, 2015. 

20.          *Y. Wan, D. Yan, J. Bullock, X. Zhang, and A. Cuevas, "Passivation of c-Si surfaces by sub-nm amorphous silicon capped with silicon nitride," Applied Physics Letters, vol. 107, p. 231606, 2015.

21.          *Y. Wan, K. R. McIntosh, A. F. Thomson, and A. Cuevas, "Recombination and thin film properties of silicon nitride and amorphous silicon passivated c-Si following ammonia plasma exposure," Applied Physics Letters, vol. 106, p. 041607, 2015.

22.          *Y. Wan, J. Bullock, and A. Cuevas, "Passivation of c-Si surfaces by ALD tantalum oxide capped with PECVD silicon nitride," Solar Energy Materials and Solar Cells, vol. 142, pp. 42-46, 2015. 

23.          *Y. Wan, J. Bullock, and A. Cuevas, "Tantalum oxide/silicon nitride: A negatively charged surface passivation stack for silicon solar cells," Applied Physics Letters, vol. 106, p. 201601, 2015.

24.          A. Thomson, Y. Wan, N. Lal, and R. G. Elliman, "Graded silicon nitride films: Optics and passivation," Journal of Vacuum Science & Technology A, vol. 33, p. 060610, 2015. 

25.          A. Thomson, N. Lal, and Y. Wan, "Interpolating the optical properties of varied composition silicon nitride," physica status solidi (b), vol. 252, pp. 2230-2235, 2015.

26.          N. Grant, F. Rougieux, D. Macdonald, J. Bullock, and Y. Wan, "Grown-in defects limiting the bulk lifetime of p-type float-zone silicon wafers," Journal of Applied Physics, vol. 117, p. 055711, 2015.

27.          J. Bullock, C. Samundsett, A. Cuevas, D. Yan, Y. Wan, and T. Allen, "Proof-of-Concept p-Type Silicon Solar Cells With Molybdenum Oxide Local Rear Contacts," IEEE Journal of Photovoltaic, 2015.

28.          J. Bullock, A. Cuevas, C. Samundsett, D. Yan, J. McKeon, and Y. Wan, "Simple silicon solar cells featuring an a-Si: H enhanced rear MIS contact," Solar Energy Materials and Solar Cells, vol. 138, pp. 22-25, 2015.

29.          X. Zhang, S. Hargreaves, Y. Wan, and A. Cuevas, "Surface passivation of crystalline silicon by sputter deposited hydrogenated amorphous silicon," physica status solidi (RRL)-Rapid Research Letters, vol. 8, pp. 231-234, 2014. 

30.          E. Franklin, K. Fong, K. McIntosh, A. Fell, A. Blakers, T. Kho, D. Walter, D. Wang, N. Zin, and M. Stocks, E. Wang, N. Grant, Y. Wan, Y. Yang, X. Zhang, Z. Feng and P. J. Verlinden "Design, fabrication and characterisation of a 24.4% efficient interdigitated back contact solar cell," Progress in Photovoltaics: Research and Applications, 2014.

31.          J. Bullock, D. Yan, Y. Wan, A. Cuevas, B. Demaurex, A. Hessler-Wyser, and S. De Wolf, "Amorphous silicon passivated contacts for diffused junction silicon solar cells," Journal of Applied Physics, vol. 115, p. 163703, 2014. 

32.          *Y. Wan, K. R. McIntosh, A. F. Thomson, and A. Cuevas, "Low surface recombination velocity by low-absorption silicon nitride on c-Si," IEEE Journal of Photovoltaics, vol. 3, pp. 554-559, 2013. 

33.          *Y. Wan, K. R. McIntosh, and A. F. Thomson, "Characterisation and optimisation of PECVD SiNx as an antireflection coating and passivation layer for silicon solar cells," AIP Advances, vol. 3, p. 032113, 2013.

34.          Y. Wan and K. R. McIntosh, "On the surface passivation of textured C-Si by PECVD silicon nitride," IEEE Journal of Photovoltaics, vol. 3, pp. 1229-1235, 2013.

36.          S. C. Baker-Finch, K. R. McIntosh, M. L. Terry, and Y. Wan, "Isotextured silicon solar cell analysis and modeling 2: Recombination and device modeling," IEEE Journal of Photovoltaics, vol. 2, pp. 465-472, 2012.

Refereed conference papers

37.          *Y. Wan, C. Samundsett, J. Bullock, D. Yan, T. Allen, J. Peng, J. Cui, M. Hettick, A. Javey and A. Cuevas., “Efficient electron contacts for n-type silicon solar cells using Magnesium metal, oxide, and fluoride” in Photovoltaic Specialists Conference (PVSC), IEEE 44th, Washington DC, 2017 [Oral]

38.          *J. Bullock, Z. Xu, M. Hettick, S. Essig, H. Qian, Y. Wan, A. Thomson, A. Cuevas and A. Javey, “Stability of low temperature, dopant-free, selective contacts for crystalline silicon solar cells” in Photovoltaic Specialists Conference (PVSC), IEEE 44th, Washington DC, 2017 [Oral]

39.          *Y. Wan, C. Samundsett, J. Bullock, D. Yan, T. Allen, P. Zheng, X. Zhang, J. Cui, J. McKeon, and A. Cuevas., "Magnesium fluoride based electron-selective contact," in Photovoltaic Specialists Conference (PVSC), 2016 IEEE 43rd, 2016, pp. 2540-2542. [Poster]

40.          P. Zheng, F. E. Rougieux, C. Samundsett, X. Yang, Y. Wan, J. Degoulange, R. Einhaus, P. Rivat, and D. Macdonald, "Simulation of 20.96% efficiency n-type Czochralski UMG silicon solar cell," Energy Procedia, vol. 92, pp. 434-442, 2016. [Oral]

41.          J. Bullock, Y. Wan, M. Hettick, J. Geissbühler, A. J. Ong, D. Kiriya, D. Yan, T. Allen, J. Peng, Z. Xinyu, C. M. Sutter-Fella, S. D. W. C. Ballif, A. Cuevas, and A. Javey, "Survey of Dopant-Free Carrier-Selective Contacts for Silicon Solar Cells," in IEEE 43rd Photovoltaic Specialist Conference (PVSC), Portland, Oregon, 2016. [Oral]

42.          T. G. Allen, P. Zheng, B. Vaughan, M. Barr, Y. Wan, C. Samundsett, J. Bullock, and A. Cuevas, "Low resistance calcium contacts to lightly doped n-type crystalline silicon solar cells," in IEEE 43rd Photovoltaic Specialists Conference (PVSC), Portland, OR, 2016. [Oral]

43.          Z. Lu, Z. Ouyang, N. Grant, Y. Wan, D. Yan, and A. Lennon, "Manipulation of stored charge density and polarity in anodic aluminium oxide for silicon solar cell passivation," Energy Procedia, vol. 77, pp. 816-821, 2015. [Poster]

44.          *A. Cuevas, T. Allen, J. Bullock, Y. Wan, and X. Zhang, "Skin care for healthy silicon solar cells," in Photovoltaic Specialist Conference (PVSC), 2015 IEEE 42nd, 2015, pp. 1-6. [Invited oral]

45.          J. Bullock, D. Yan, A. Cuevas, Y. Wan, and C. Samundsett, "n-and p-typesilicon Solar Cells with Molybdenum Oxide Hole Contacts," Energy Procedia, vol. 77, pp. 446-450, 2015. [Poster]

46.          *D. Yan, A. Cuevas, J. Bullock, and Y. Wan, "Development of a self-aligned etch-back process for selectively doped silicon solar cells," in 2014 IEEE 40th Photovoltaic Specialist Conference (PVSC), 2014, pp. 2545-2549. [Poster]

47.          Y. Wan, D. Yan, A. Cuevas, and K. R. McIntosh, "Influence of the NH 3: SiH 4 ratio and surface morphology on the surface passivation of phosphorus-diffused C-Si by PECVD SiN x," in 2014 IEEE 40th Photovoltaic Specialist Conference (PVSC), 2014, pp. 3317-3321. [Oral]

48.          *Y. Wan, C. Samundsett, T. Kho, J. McKeon, L. Black, D. Macdonald, A. Cuevas, J. Sheng, Y. Sheng, S. Yuan, C. Zhang, Z. Feng, and P. J. Verlinden, "Towards industrial advanced front-junction n-type silicon solar cells," in 2014 IEEE 40th Photovoltaic Specialist Conference (PVSC), 2014, pp. 0862-0865. [Oral]

49.          K. McIntosh, T. Kho, K. Fong, S. Baker-Finch, Y. Wan, N. Zin, E. Franklin, D. Wang, M. Abbott, and N. Grant, "Quantifying the optical losses in back-contact solar cells," in 2014 IEEE 40th Photovoltaic Specialist Conference (PVSC), 2014, pp. 0115-0123. [Plenary Oral]

50.          Y. Wan, K. McIntosh, A. Thomson, and A. Cuevas, "Surface passivation of pyramidally and isotropically textured c-Si by PECVD SiNx and a-Si: H," in SNEC 7th, 2013. [Oral]

51.          H. C. Sio, S. P. Phang, Y. Wan, W. Liang, T. Trupke, S. Cao, D. Hu, Y. Wan, and D. Macdonald, "The influence of crystal orientation on surface passivation in multi-crystalline silicon," in 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC), 2013, pp. 1770-1775. [Oral]

52.          N. E. Grant, K. R. McIntosh, J. Tan, F. Rougieux, J. Bullock, Y. Wan, and C. Barugkin, "Light enhanced hydrofluoric acid passivation for evaluating silicon bulk lifetimes," 28. th. European Photovoltaic Solar Energy Conference, pp. 883-887, 2013. [Oral]

53.          A. Blakers, K. Fong, E. Franklin, N. Grant, Y. Wan, D. Wang, S. Zin, T. Kho, and K. McIntosh, "24.6% efficient back contact cell with oxide-nitride passivation," Proc. 23rd Int. PVSEC, 2013. [Oral]

54.          Y. Wan, K. R. McIntosh, and A. F. Thomson, "Characterization of stress in amorphous silicon nitride and implications to c-Si surface passivation," in Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE, 2012, pp. 001139-001143. [Poster]

55.          K. R. McIntosh, L. E. Black, S. C. Baker-Finch, T. C. Kho, and Y. Wan, "Determination of the Magnitude and Centroid of the Charge in a Thin-film Insulator by CV and Kelvin Probe Measurements," Energy Procedia, vol. 15, pp. 162-170, 2012. [Oral]

Invited talks

56.           “Advanced Surface and Contact Passivation for Simple, Efficient Silicon Solar Cells”, Shanghai Jiaotong University,2017

57.          “Advanced Surface and Contact Passivation for Simple, Efficient Silicon Solar Cells”,Nankai University,2017

58.          “Advanced Surface and Contact Passivation for Simple, Efficient Silicon Solar Cells”,Soochow University,2017

59.          “Highly transparent and highly passivating silicon nitride for solar cells”, Trina Solar, 2015

60.           “Passivation by tantalum oxide / silicon nitride of crystalline silicon surfaces”, Konstance Silicon Photovoltaic Conference, 2015

61.          “Highly transparent and highly passivating silicon nitride for solar cells”, University of New South Wales, 2014

Patent applications

62.          Y. Wan, A. Cuevas, J. Cui, Y. Chen, Y. Cui and P. Verlinden, ‘High efficiency solar cell using tantalum oxide (Ta2O5) as optical and passivating material’, 2016, Chinese provisional patent application.

63.          J. Cui, Y. Chen, Y. Wan, A. Cuevas, X. Zhang, T. Allen, Y. Cui, and P. Verlinden, ‘A method to deposit dielectric thin film (TiO2) on silicon substrate and its application in solar cells’, 162996-1CNCN, 2016, Chinese provisional patent application;

64.          J. Cui, Y. Chen, Y. Wan, A. Cuevas, Y. Cui, and P. Verlinden, ‘High efficiency solar cell using hafnium oxide (HfO2) as optical and passivating material’, 2016, Chinese provisional patent application.

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