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Benzochalcogenodiazole‐Based Donor–Acceptor–Acceptor Molecular Donors for Organic Solar Cells
Author(s) -
Ting HaoChun,
Chen YiHong,
Lin LiYen,
Chou ShuHua,
Liu YiHung,
Lin HaoWu,
Wong KenTsung
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201301090
Subject(s) - acceptor , organic solar cell , moiety , molecule , electron acceptor , photochemistry , molecular engineering , materials science , electron donor , electrochemistry , chemistry , energy conversion efficiency , electrode , nanotechnology , optoelectronics , stereochemistry , catalysis , organic chemistry , condensed matter physics , polymer , physics
Abstract Four new molecules with a donor–acceptor–acceptor (D‐A‐A) configuration, in which 2,1,3‐benzoxadiazole or 2,1,3‐benzoselenodiazole were adopted as the central bridging acceptor, were synthesized as electron donors for small‐molecule organic solar cells. In conjunction with two previously reported 2,1,3‐benzothiadiazole‐based compounds, the influences of the benzochalcogenodiazole acceptor unit and the ditolylarylamine donor moiety on the molecular structure, electrochemical behavior, and optical properties of the materials were investigated systematically to obtain a clear structure–property relationship. Vacuum‐deposited hybrid planar mixed‐heterojunction devices fabricated with the new donors and C 70 as the acceptor showed power conversion efficiencies in the range of 2.9–4.3 % under 1 sun (100 mW cm −2 ) AM 1.5 G simulated solar illumination. The current density–voltage characteristics of solar cells at various light intensities were measured, which revealed a high bimolecular recombination.