Benzotriazole Based 2D-conjugated Polymer Donors for High Performance Polymer Solar Cells
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FEATURE ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2496-5 Chinese J. Polym. Sci.
Benzotriazole Based 2D-conjugated Polymer Donors for High Performance Polymer Solar Cells Zhi-Guo Zhanga*, Yang Baia, and Yongfang Lib,c* a State
Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China b Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China c Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
Abstract To design high efficiency polymer solar cells (PSCs), it is of great importance to develop suitable polymer donors that work well with the low bandgap acceptors, providing complementary absorption, forming interpenetrating networks in the active layers and minimizing energy loss. Recently, we developed a series of two-dimension-conjugated polymers based on bithienylbenzodithiophene-alt-benzotriazole backbone bearing different conjugated side chains, generally called J-series polymers. They are medium energy bandgap (Eg) polymers (Eg of ca. 1.80 eV) with strong absorptions in the range of 400−650 nm, and exhibit ordered crystalline structures, high hole mobilities, and more interestingly, tunable energy levels depending on the structure variations. In this feature article, we highlight our recent efforts on the design and synthesis of those J-series polymer donors, including an introduction on the polymer design strategy and emphasis on the crucial function of differential conjugated side chain. Finally, the future opportunities and challenges of the J-series polymers in PSCs are discussed. Keywords Polymer solar cells; Benzotriazole based 2D-conjugated polymer; J-series polymers Citation: Zhang, Z. G.; Bai, Y.; Li, Y. Benzotriazole based 2D-conjugated polymer donors for high performance polymer solar cells. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2496-5
INTRODUCTION Polymer solar cells (PSCs) are attracting extensive studies for the generation of affordable, clean, low-cost, and renewable energy due to their advantages of lightweight, flexibility and solution processing.[1] Generally, PSCs are fabricated with a bulk heterojunction structure using a p-type conjugated polymer as donor and an n-type organic semiconductor (n-OS) as acceptor (traditional fullerene derivatives, such as PC71BM in Fig. 1).[2] Recently, PSCs have witnessed a dramatical progress with power conversion efficiencies (PCEs) up to 17%,[3−6] which greatly benefits from the advances of n-OSs and n-type conjugated polymer (nCP) as acceptors with favorable advantages of accessibility, strong absorption in the visible-near infrared region and adjustable energy levels.[7−11] Inspired by the attractive features, a variety of n-OSs and n-CPs (such as N2200 in Fig. 1)
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