Department of Chemistry, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada.
J Am Chem Soc. 2014 Dec 10;136(49):17116-22. doi: 10.1021/ja508758k. Epub 2014 Nov 26.
The recent breakthrough of organometal halide perovskites as the light harvesting layer in photovoltaic devices has led to power conversion efficiencies of over 16%. To date, most perovskite solar cells have adopted a structure in which the perovskite light absorber is placed between carrier-selective electron- and hole-transport layers (ETLs and HTLs). Here we report a new type of compact layer free bilayer perovskite solar cell and conclusively demonstrate that the ETL is not a prerequisite for obtaining excellent device efficiencies. We obtained power conversion efficiencies of up to 11.6% and 13.5% when using poly(3-hexylthiophene) and 2,2',7,7'-tetrakis(N,N-di(4-methoxyphenyl)amino)-9,9'-spirobifluorene, respectively, as the hole-transport material. This performance is very comparable to that obtained with the use of a ZnO ETL. Impedance spectroscopy suggests that while eliminating the ZnO leads to an increase in contact resistance, this is offset by a substantial decrease in surface recombination.
最近，金属卤化物钙钛矿在光伏器件中的光收集层方面取得了突破，其能量转换效率超过了 16%。迄今为止，大多数钙钛矿太阳能电池采用的结构是，钙钛矿光吸收体置于载流子选择性电子和空穴传输层（ETL 和 HTL）之间。在这里，我们报告了一种新型无致密层双层钙钛矿太阳能电池，并最终证明 ETL 并不是获得优异器件效率的必要条件。当使用聚（3-己基噻吩）和 2,2',7,7'-四（N,N-二（4-甲氧基苯基）氨基）-9,9'-螺二芴分别作为空穴传输材料时，我们获得了高达 11.6%和 13.5%的能量转换效率。这种性能与使用 ZnO ETL 获得的性能非常相当。阻抗谱表明，虽然消除 ZnO 会导致接触电阻增加，但这可以通过表面复合的大幅减少来抵消。
