کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5435351 | 1509346 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Comparison of spiro-OMeTAD and its cheaper analogue as HTMs in perovskite cells;.
- Charge transfer dynamics from femtoseconds to seconds explored;.
- Slower hole injection and recombination for Ã60 than spiro-OMeTAD;.
- High APCE of thin perovskite solar cells prepared at room conditions;.
Perovskite solar cells with popular 2,2â²,7,7â²-tetrakis(N,N-di-p-methoxyphenylamine)-9,9â²-spirobifluorene (spiro-OMeTAD) as the hole transporting material are compared to those prepared with 2,2â²,7,7â²-tetrakis(N,N-di(4-methoxyphenyl)amino)-spiro-(fluorene-9,9â²-xanthene) (X60), its recently proposed new and potentially cheaper alternative, and with a mixture of both materials. The cells with both small-molecule transporters have similar photocurrent and photovoltage, but the cells with X60 exhibit about 13% smaller fill factor than those with spiro-OMeTAD. The dynamics of the interfacial charge transfer occurring on the time scales from femtoseconds to seconds is explored. The overall hole injection is slower from methylammonium lead iodide to X60 than that to spiro-OMeTAD by about 0.04Â nsâ1. Similarly, slower hole recombination is found for the cells with X60, taking place on the millisecond time scale in the dark. The recombination under illumination is accelerated more for Ã60 material, which might explain the differences in fill factor values. The cells with the 1:1 mixture of spiro-OMeTAD and X60 show intermediate behavior in all aspects, revealing that a simple combination of small molecule transporters can be used to tune the properties of HTM.
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Journal: Synthetic Metals - Volume 232, October 2017, Pages 181-187