有机太阳能电池
机制(生物学)
接受者
材料科学
化学工程
化学
化学物理
聚合物
物理
复合材料
凝聚态物理
量子力学
工程类
作者
Jonas Kublitski,Giacomo Londi,Felix Talnack,Mike Hambsch,Shen Xing,Jakob Wolansky,Stefan C. B. Mannsfeld,Koen Vandewal,Johannes Benduhn,Karl Leo,David Beljonne,Donato Spoltore
标识
DOI:10.1021/acs.chemmater.3c02263
摘要
Organic solar cells offer several advantages over conventional photovoltaics, such as flexibility, low cost, and abundant materials, and are thus seen as a promising choice for energy harvesting. A rather particular case refers to diluted systems, where a small number of electron-donating molecules are dispersed within an acceptor matrix, hampering hole transport in the absence of percolation paths. Nonetheless, diluted systems present a reasonable performance, thereby raising discussions on how this is achieved. Here, we investigate the hole transport by measuring the hole mobility in several systems with varying donor concentrations. We found an unexpected correlation between the hole mobility and the energy offset between the donor HOMO and the acceptor LUMO (instead of the acceptor HOMO), with the mobility increasing as the offset decreases. Such a correlation is supported by molecular modeling suggesting a contribution from the acceptor LUMO-mediated superexchange mechanism. These results corroborate our experimental observation, hinting at a previously neglected mechanism of transport, which depends on the coupling between the donor HOMO and the acceptor LUMO.
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