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Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
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Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
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Journal Article
Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
2019
Overview
We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectroscopy of material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We conclude that, for the device series studied, the photocurrent loss with thick active layers is primarily associated with the accumulation of photo-generated charge carriers in intra-bandgap tail states. This charge accumulation screens the device internal electrical field, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail state distribution and density and increase the maximal photoactive thickness for efficient operation. Our work suggests that selecting organic photoactive layers with a narrow distribution of tail states is a key requirement for the fabrication of efficient, high photocurrent, thick organic solar cells.
The power conversion efficiencies of most organic solar cells roll off quickly with thickness more than 100 nm. Here, Wu et al. show that avoiding excessive charge accumulation in the intra-bandgap tail states is vital to maintain the photocurrent generation at high thickness.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
