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Synthesis and Photovoltaic Properties of Donor–Acceptor Copolymer Based on Dithienopyrrole and Thienopyrroledione
Author(s) -
Zhou Erjun,
Cong Junzi,
Tajima Keisuke,
Yang Chunhe,
Hashimoto Kazuhito
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000584
Subject(s) - homo/lumo , copolymer , cyclic voltammetry , acceptor , polymer , open circuit voltage , materials science , absorption spectroscopy , energy conversion efficiency , polymer solar cell , pyrrole , polymer chemistry , photochemistry , chemistry , electrochemistry , molecule , organic chemistry , electrode , optoelectronics , voltage , optics , physics , quantum mechanics , composite material , condensed matter physics
Abstract A novel donor–acceptor (D–A) type alternating copolymer based on dithieno[3,2‐b:2′,3′‐d]pyrrole (DTP) and thieno[3,4‐c]pyrrole‐4,6‐dione (TPD) was synthesized. The polymer has a broad absorption spectrum in the range of 350–810 nm. The energy levels of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the copolymer were −5.11 and −3.63 eV, respectively, as determined by cyclic voltammetry. Bulk heterojunction type polymer solar cells based on PDTP‐TPD and PC 70 BM, showed power conversion efficiency (PCE) up to 1.6% with an open‐circuit voltage of V OC = 0.66 V, a short‐circuit current of I SC = 4.98 mA · cm −2 , and a fill factor of FF = 0.50. The V OC of 0.66 V is the highest value among DTP‐based photovoltaic polymers.