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Interface passivation using ultrathin polymer–fullerene films for high-efficiency perovskite solar cells with negligible hysteresis
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2017-07-03 00:00:00 , DOI: 10.1039/c7ee01096f
Jun Peng 1, 2, 3, 4 , Yiliang Wu 1, 2, 3, 4 , Wang Ye 5, 6, 7, 8, 9 , Daniel A. Jacobs 1, 2, 3, 4 , Heping Shen 1, 2, 3, 4 , Xiao Fu 1, 2, 3, 4 , Yimao Wan 1, 2, 3, 4 , The Duong 1, 2, 3, 4 , Nandi Wu 1, 2, 3, 4 , Chog Barugkin 1, 2, 3, 4 , Hieu T. Nguyen 1, 2, 3, 4 , Dingyong Zhong 5, 6, 7, 8, 9 , Juntao Li 5, 6, 7, 8, 9 , Teng Lu 2, 3, 4, 10 , Yun Liu 2, 3, 4, 10 , Mark N. Lockrey 2, 3, 11, 12, 13 , Klaus J. Weber 1, 2, 3, 4 , Kylie R. Catchpole 1, 2, 3, 4 , Thomas P. White 1, 2, 3, 4, 5
Affiliation  

Interfacial carrier recombination is one of the dominant loss mechanisms in high efficiency perovskite solar cells, and has also been linked to hysteresis and slow transient responses in these cells. Here we demonstrate an ultrathin passivation layer consisting of a PMMA:PCBM mixture that can effectively passivate defects at or near to the perovskite/TiO2 interface, significantly suppressing interfacial recombination. The passivation layer increases the open circuit voltage of mixed-cation perovskite cells by as much as 80 mV, with champion cells achieving Voc ∼ 1.18 V. As a result, we obtain efficient and stable perovskite solar cells with a steady-state PCE of 20.4% and negligible hysteresis over a large range of scan rates. In addition, we show that the passivated cells exhibit very fast current and voltage response times of less than 3 s under cyclic illumination. This new passivation approach addresses one of the key limitations of current perovskite cells, and paves the way to further efficiency gains through interface engineering.

中文翻译:

使用超薄聚合物-富勒烯薄膜进行界面钝化,可将滞后效应忽略不计的高效钙钛矿太阳能电池

界面载流子复合是高效钙钛矿太阳能电池中主要的损耗机制之一,并且还与这些电池中的磁滞现象和缓慢的瞬态响应有关。在这里,我们演示了一种由PMMA:PCBM混合物组成的超薄钝化层,可以有效钝化钙钛矿/ TiO 2界面处或附近的缺陷,从而显着抑制界面复合。钝化层将混合阳离子钙钛矿电池的开路电压提高了80 mV,冠军电池达到了V oc约1.18V。结果,我们获得了高效稳定的钙钛矿型太阳能电池,其稳态PCE为20.4%,并且在大范围的扫描速率下具有可忽略的滞后性。此外,我们表明,在循环照明下,钝化的电池显示出非常快的电流和电压响应时间,小于3 s。这种新的钝化方法解决了目前钙钛矿电池的关键限制之一,并为通过界面工程进一步提高效率铺平了道路。
更新日期:2017-08-09
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