Abstract
Activation energy for charge transport, carrier concentration and recombination rate are identified to strongly affect the device characteristics.
Highlights
Non-fullerene acceptors (NFAs) have attracted considerable attention as an alternative to commonly used fullerene-based acceptor materials over the last few years
In the course of this study, we systematically investigated the in uence of the molecular weight of PTB7-Th on the photovoltaic performance of polymer:small molecule nonfullerene organic solar cells (NF-OSCs) using
The best performance was obtained using the high molecular weight polymer (200 kDa) with a VOC of 1.00 V, a JSC of 15.44 mA cmÀ2, a FF of 64.6%, and a power conversion efficiency (PCE) of 9.94%, which are among the highest values for fullerene-based and fullerenefree OSCs in the same device geometry using the low bandgap polymer PTB7-Th as the donor.[32,37]
Summary
Non-fullerene acceptors (NFAs) have attracted considerable attention as an alternative to commonly used fullerene-based acceptor materials over the last few years.
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