Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China.
Adv Mater. 2019 Mar;31(12):e1807842. doi: 10.1002/adma.201807842. Epub 2019 Feb 7.
In this paper, two near-infrared absorbing molecules are successfully incorporated into nonfullerene-based small-molecule organic solar cells (NFSM-OSCs) to achieve a very high power conversion efficiency (PCE) of 12.08%. This is achieved by tuning the sequentially evolved crystalline morphology through combined solvent additive and solvent vapor annealing, which mainly work on ZnP-TBO and 6TIC, respectively. It not only helps improve the crystallinity of the ZnP-TBO and 6TIC blend, but also forms multilength scale morphology to enhance charge mobility and charge extraction. Moreover, it simultaneously reduces the nongeminate recombination by effective charge delocalization. The resultant device performance shows remarkably enhanced fill factor and J . These result in a very respectable PCE, which is the highest among all NFSM-OSCs and all small-molecule binary solar cells reported so far.
在本文中，两个近红外吸收分子被成功地结合到基于非富勒烯的小分子有机太阳能电池（NFSM-OSCs）中，以实现非常高的功率转换效率（PCE）为 12.08%。这是通过调整顺序演化的晶体形态来实现的，这主要通过组合溶剂添加剂和溶剂蒸汽退火来实现，分别对 ZnP-TBO 和 6TIC 起作用。它不仅有助于提高 ZnP-TBO 和 6TIC 共混物的结晶度，而且还形成多长度尺度形态，以提高电荷迁移率和电荷提取。此外，它还通过有效的电荷离域同时减少非辐射复合。所得器件性能显示出明显增强的填充因子和 J。这导致了非常可观的 PCE，这是迄今为止所有 NFSM-OSCs 和所有小分子二元太阳能电池中最高的。
