期刊
ACS ENERGY LETTERS
卷 2, 期 1, 页码 270-278出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00587
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资金
- Office of Naval Research [N00014-13-1-0490]
- NSF MRSEC Program [DMR-14-20703]
- Department of Energy (DOE) SunS hot program [DE-EE0005312]
- II-VI Foundation
Recently, solution-processing became a viable route for depositing CdTe for use in photovoltaics. Ultrathin (similar to 500 nm) solar cells have been made using colloidal CdTe nanocrystals with efficiencies exceeding 12% power conversion efficiency (PCE) demonstrated by using very simple device stacks. Further progress requires an effective method for extracting charge carriers generated during light harvesting. Here, we explored solution-based methods for creating transparent Ohmic contacts to the solution-deposited CdTe absorber layer and demonstrated molecular and nanocrystal approaches to Ohmic hole extracting contacts at the ITO/CdTe interface. We used scanning Kelvin probe microscopy to further show how the above approaches improved carrier collection by reducing the potential drop under reverse bias across the ITO/CdTe interface. Other methods, such as spin-coating CdTe/A(2)CdTe(2) (A = Na, K, Cs, N2H5), can be used in conjunction with current/light soaking to improve PCE further.
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