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Significantly Enhancing the Efficiency of a New Light‐Harvesting Polymer with Alkylthio naphthyl Substituents Compared to Their Alkoxyl Analogs
Author(s) -
Huang Gongyue,
Zhang Jun,
Uranbileg Nergui,
Chen Weichao,
Jiang Huanxiang,
Tan Hua,
Zhu Weiguo,
Yang Renqiang
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702489
Subject(s) - materials science , ternary operation , alkoxy group , fullerene , energy conversion efficiency , polymer , molecule , homo/lumo , derivative (finance) , photovoltaic system , photochemistry , organic chemistry , optoelectronics , alkyl , composite material , chemistry , ecology , computer science , financial economics , economics , biology , programming language
In this work, a new benzo[1,2‐ 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 PC 71 BM and the fullerene‐free small molecule ITIC as acceptors, respectively. Surprisingly, ternary blend devices based on PBDTNS‐BDD and two acceptors, namely PC 71 BM 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.