期刊
NANO LETTERS
卷 14, 期 2, 页码 670-675出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403912w
关键词
Nanocrystals; photovoltaics; CdTe; sintering; optoelectronic materials
类别
资金
- DOE SunShot program [DE-EE0005312]
- US Department of Energy [DE-AC02-06CH11357]
- NSF MRSEC Program [DMR-0213745]
Solution processing of photovoltaic semiconducting layers offers the potential for drastic cost reduction through improved materials utilization and high device throughput. One compelling solution-based processing strategy utilizes semiconductor layers produced by sintering nanocrystals into large-grain semiconductors at relatively low temperatures. Using n-ZnO/p-CdTe as a model system, we fabricate sintered CdTe nanocrystal solar cells processed at 350 degrees C with power conversion efficiencies (PCE) as high as 12.3%. J(SC) of over 25 mA cm(-2) are achieved, which are comparable or higher than those achieved using traditional, close-space sublimated CdTe. We find that the V-OC can be substantially increased by applying forward bias for short periods of time. Capacitance measurements as well as intensity- and temperature-dependent analysis indicate that the increased V-OC is likely due to relaxation of an energetic barrier at the ITO/CdTe interface.
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