Zhang Mingyu, Wang Jiayu, Li Liang, Zheng Guanhaojie, Liu Kuan, Qin Meng, Zhou Huanping, Zhan Xiaowei
Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 P. R. China.
Adv Sci (Weinh). 2017 Apr 21;4(9):1700025. doi: 10.1002/advs.201700025. eCollection 2017 Sep.
A high-mobility p-type organic semiconductor based on benzodithiophene and diketopyrrolopyrrole with linear alkylthio substituents (BDTS-2DPP) is used as a dual function interfacial layer to modify the interface of perovskite/2,2',7,7'-tetrakis('-di--methoxyphenylamine)-9,9'-spirobifluorene in planar perovskite solar cells. The BDTS-2DPP layer can remarkably passivate the surface defects of perovskite through the formation of Lewis adduct between the under-coordinated Pb atoms in perovskite and S atoms in BDTS-2DPP, and also shows efficient hole extraction and transfer properties. The devices with BDTS-2DPP interlayer show a peak power conversion efficiency of 18.2%, which is higher than that of reference devices without the BDTS-2DPP interlayer (16.9%). Moreover, the hydrophobic BDTS-2DPP interlayer effectively protects the perovskite against moisture, leading to enhanced device stability.
一种基于苯并二噻吩和具有线性烷基硫代取代基的二酮吡咯并吡咯的高迁移率 p 型有机半导体（BDTS-2DPP）被用作双功能界面层，以修饰平面钙钛矿太阳能电池中钙钛矿/2,2',7,7'-四（-二-甲氧基苯胺）-9,9'-螺二芴的界面。BDTS-2DPP 层可以通过钙钛矿中配位不足的 Pb 原子与 BDTS-2DPP 中的 S 原子形成路易斯加合物，显著钝化钙钛矿的表面缺陷，并且还表现出高效的空穴提取和传输性能。具有 BDTS-2DPP 中间层的器件峰值功率转换效率为 18.2%，高于没有 BDTS-2DPP 中间层的参考器件（16.9%）。此外，疏水性的 BDTS-2DPP 中间层有效地保护钙钛矿免受湿气影响，从而提高了器件稳定性。
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