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Enhanced Hole Transport in Ternary Blend Polymer Solar Cells
Author(s) -
Midori Koshiro,
Fukuhara Tomohiro,
Tamai Yasunari,
Do Kim Hyung,
Ohkita Hideo
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900343
Subject(s) - ternary operation , materials science , band gap , polymer , polymer solar cell , fullerene , optoelectronics , absorption (acoustics) , electron mobility , polymer blend , solar cell , chemical engineering , organic chemistry , chemistry , copolymer , composite material , computer science , engineering , programming language
Recently, ternary blend polymer solar cells have attracted great attention to improve a short‐circuit current density ( J SC ) effectively, because complementary absorption bands can harvest the solar light over a wide wavelength range from visible to near‐IR region. Interestingly, some ternary blend solar cells have shown improvements not only in J SC but also in fill factor (FF). Previously, we also reported that a ternary blend solar cell based on a low‐bandgap polymer (PTB7‐Th), a wide‐bandgap polymer (PDCBT), and a fullerene derivative (PCBM) exhibited a higher FF than their binary analogues. Herein, we study charge transport in PTB7‐Th/PDCBT/PCBM ternary blend films to address the origin of the improvement in FF. We found that hole polarons are located in PTB7‐Th domains and their mobility is enhanced in the ternary blend film.