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Issue 38, 2016
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Efficient ternary blend all-polymer solar cells with a polythiophene derivative as a hole-cascade material

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Abstract

Ternary blending is one of the effective strategies to broaden the complementary absorption range and smooth the energy level at the donor/acceptor interface for achieving high efficiency bulk heterojunction (BHJ) polymer solar cells (PSCs). In this study, we report efficient ternary blend all-polymer solar cells (all-PSCs) with complementary absorption bands based on two polymer donors PTB7-Th and PBDD-ff4T and one polymer acceptor N2200. The polythiophene derivative PBDD-ff4T as a hole-cascade material plays a bridging role in energy levels between PTB7-Th and N2200, and thus provides more efficient channels for charge transfer. The ternary all-PSCs with 10 wt% PBDD-ff4T content show efficient photon harvesting, enhanced charge mobility and better active layer morphology due to the induced crystallization of PTB7-Th by the inserted PBDD-ff4T in the donor domains. As a result, the device without any extra treatments exhibits an optimized power conversion efficiency (PCE) of 7.2% with an open circuit voltage (Voc) of 0.82 V, a short circuit current density (Jsc) of 15.7 mA cm−2, and a fill factor (FF) of 56%. While the PCEs are 5.9% and 4.2% for the all-PSCs based on the binary blends PTB7-Th:N2200 and PBDD-ff4T:N2200, respectively. This PCE of 7.2% is one of the highest values reported in the literature so far for ternary all-PSCs and polythiophene derivative-based all-PSCs.

Graphical abstract: Efficient ternary blend all-polymer solar cells with a polythiophene derivative as a hole-cascade material

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Supplementary files

Article information


Submitted
14 Jul 2016
Accepted
24 Aug 2016
First published
25 Aug 2016

J. Mater. Chem. A, 2016,4, 14752-14760
Article type
Paper

Efficient ternary blend all-polymer solar cells with a polythiophene derivative as a hole-cascade material

W. Su, Q. Fan, X. Guo, B. Guo, W. Li, Y. Zhang, M. Zhang and Y. Li, J. Mater. Chem. A, 2016, 4, 14752
DOI: 10.1039/C6TA05932E

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