Methyl Thioether Functionalization of a Polymeric Donor for Efficient Solar Cells Processed from Non-Halogenated Solvents


Polymer solar cells (PSCs) processed from non-halogenated solvents are favorable for large scale production. However, the photovoltaic performance of devices from non-halogenated solvents is generally inferior to that of the counterparts from halogenated solvents. Herein, we report the utilization of 5-alkyl-4-(methylthio)­thiophene (MTT) as a conjugated side chain of the polymeric donor to achieve efficient PSCs processed from toluene. The derived polymer PMTT56 exhibits lower energy levels than the 5-alkyl-4-methoxythiophene (MOT) counterpart (PMOT39) and 5-(alkylthio)­thiophene counterpart (PEHTT). PMTT56 is superior to PMOT39 with an enhanced interchain interaction and hole mobility, and also shows better solubility than PEHTT in toluene. In toluene-processed PSCs, the PMTT56 devices deliver a power conversion efficiency (PCE) of up to 12.6% with IT-2F as the acceptor. By introducing [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) as the second acceptor, a remarkable PCE of 13.2% is further achieved in the ternary devices, which is among the best for PSCs processed from toluene. Our study presents a fine-tuning approach to develop efficient organic photovoltaic materials processed from non-halogenated solvents

Similar works

Full text

thumbnail-image time updated on 5/30/2019

This paper was published in FigShare.

Having an issue?

Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.