Significantly Enhancing the Efficiency of a New Light‐Harvesting Polymer with Alkylthio naphthyl Substituents Compared to Their Alkoxyl Analogs |
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| Authors: | Gongyue Huang Jun Zhang Nergui Uranbileg Weichao Chen Huanxiang Jiang Hua Tan Weiguo Zhu Renqiang Yang |
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| Affiliation: | 1. CAS Key Laboratory of Bio‐based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, P. R. China;2. College of Chemistry, Xiangtan University, Xiangtan, P. R. China;3. College of Textiles & Clothing, Qingdao University, Qingdao, P. R. China;4. School of Materials Science and Engineering, Changzhou University, Changzhou, P. R. China |
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| Abstract: | In this work, a new benzo1,2‐b:4,5‐b′]dithiophene (BDT) building block containing alkylthio naphthyl as a side chain is designed and synthesized, and the resulting polymer, namely PBDTNS‐BDD, shows a lower HOMO energy level than that of its alkoxyl naphthyl counterpart PBDTNO‐BDD. An optimized photovoltaic device using PBDTNS‐BDD as a donor exhibits power conversion efficiencies (PCE) of 8.70% and 9.28% with the fullerene derivative PC71BM and the fullerene‐free small molecule ITIC as acceptors, respectively. Surprisingly, ternary blend devices based on PBDTNS‐BDD and two acceptors, namely PC71BM and ITIC, shows a PCE of 11.21%, which is much higher than that of PBDTNO‐BDD based ternary devices (7.85%) even under optimized conditions. |
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| Keywords: | solar cells polymers light harvesting |
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