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Ternary Organic Solar Cells with Minimum Voltage Losses
Author(s) -
Wang Chuanfei,
Zhang Wei,
Meng Xiangyi,
Bergqvist Jonas,
Liu Xianjie,
Genene Zewdneh,
Xu Xiaofeng,
Yartsev Arkady,
Inganäs Olle,
Ma Wei,
Wang Ergang,
Fahlman Mats
Publication year - 2017
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.201700390
Subject(s) - materials science , ternary operation , band gap , polymer solar cell , acceptor , polymer , fullerene , organic solar cell , optoelectronics , exciton , hybrid solar cell , chemical physics , solar cell , organic chemistry , composite material , condensed matter physics , chemistry , physics , computer science , programming language
Abstract A new strategy for designing ternary solar cells is reported in this paper. A low‐bandgap polymer named PTB7‐Th and a high‐bandgap polymer named PBDTTS‐FTAZ sharing the same bulk ionization potential and interface positive integer charge transfer energy while featuring complementary absorption spectra are selected. They are used to fabricate efficient ternary solar cells, where the hole can be transported freely between the two donor polymers and collected by the electrode as in one broadband low bandgap polymer. Furthermore, the fullerene acceptor is chosen so that the energy of the positive integer charge transfer state of the two donor polymers is equal to the energy of negative integer charge transfer state of the fullerene, enabling enhanced dissociation of all polymer donor and fullerene acceptor excitons and suppressed bimolecular and trap assistant recombination. The two donor polymers feature good miscibility and energy transfer from high‐bandgap polymer of PBDTTS‐FTAZ to low‐bandgap polymer of PTB7‐Th, which contribute to enhanced performance of the ternary solar cell.