Journal
ACS ENERGY LETTERS
Volume 3, Issue 3, Pages 555-561Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00100
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Funding
- National Natural Science Foundation of China [61377029, 61564003, 61675017, 61705161]
- Fundamental Research Funds for the Central Universities [2017JBZ105]
- Guangxi Natural Science Foundation [2015GXNSFGA139002]
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Ternary polymer solar cells (PSCs) were commonly fabricated with two donors or two acceptors; the third component has complementary absorption spectra with a host system to improve photon harvesting. In this work, a series of nonfullerene PSCs were fabricated with J71 as the donor and IT-M and/or ITIC with an almost identical band gap as acceptors. Although IT-M and ITIC have almost identical band gaps, the two optimized binary PSCs exhibit different photovoltaic parameters. The short current density (J(sc).) and open-circuit voltage (V-oc) of J71:IT-M based PSCs are larger than those of J71:ITIC based PSCs; the other key parameter, the fill factor (FF), is just the opposite. The power conversion efficiency (PCE) of optimized ternary PSCs arrives at 11.60% by inheriting the advantages of binary PSCs. This work may provide a new strategy for preparing efficient nonfullerene ternary PSCs by selecting binary PSCs with complementary photovoltaic parameters.
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