通过优化碳纳米棒克服钙钛矿太阳能电池空穴传输层的固有缺陷。

Overcoming intrinsic defects of the hole transport layer with optimized carbon nanorods for perovskite solar cells.

作者信息

Li Zhiqi, Dong Jiajun, Han Wenbin, Ren Guanhua, Liu Chunyu, Cui Houxiao, Shen Liang, Guo Wenbin

机构信息

State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China.

出版信息

Nanoscale. 2019 May 9;11(18):8776-8784. doi: 10.1039/c9nr01836k.

DOI:10.1039/c9nr01836k

PMID:31025664

Abstract

To overcome the intrinsic chemical-reduction-activity of highly p-doped PEDOT:PSS and improve the open-circuit voltage (Voc) of planar inverted perovskite solar cells, a kind of oxidized carbon nanorods (OCNRs) is developed by a ball-milling/chemical-oxidation method and incorporated into PEDOT:PSS hole transport layer (HTL). The incorporation of OCNRs can increase the work function of the PEDOT:PSS layer, which avoids the energy-level mismatch between the PEDOT:PSS HTL and the HOMO level of the CH3NH3PbI3 perovskite layer, leading to a relatively high Voc of 1.01 V (vs. 0.92 V for the PEDOT:PSS device). Moreover, the introduction of OCNRs into the PEDOT:PSS HTL increases the grain size and uniformity of the perovskite layer, accompanied by the improved charge transport ability. As a result, the fill factor of perovskite solar cells is increased from 75.4% to 81.7%, and the best power conversion efficiency of 19.02% is achieved.

摘要

为了克服高度 p 型掺杂的聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）的固有化学还原活性，并提高平面倒置钙钛矿太阳能电池的开路电压（Voc），通过球磨/化学氧化法制备了一种氧化碳纳米棒（OCNRs），并将其引入 PEDOT:PSS 空穴传输层（HTL）。引入 OCNRs 可以提高 PEDOT:PSS 层的功函数，避免 PEDOT:PSS HTL 与 CH3NH3PbI3 钙钛矿层的最高占据分子轨道（HOMO）能级之间的能级不匹配，从而得到相对较高的 Voc，为 1.01 V（而 PEDOT:PSS 器件的 Voc 为 0.92 V）。此外，将 OCNRs 引入 PEDOT:PSS HTL 可增加钙钛矿层的晶粒尺寸和均匀性，同时提高电荷传输能力。结果，钙钛矿太阳能电池的填充因子从 75.4%提高到 81.7%，并实现了 19.02%的最佳功率转换效率。