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Carbazole‐Substituted Triphenylamine and Diketopyrrolopyrrole Alternating Copolymer for Photovoltaic Cells
Author(s) -
Bian Linyi,
Yang Dong,
Yin Liangming,
Zhang Jian,
Tang Weihua
Publication year - 2013
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.201300356
Subject(s) - homo/lumo , triphenylamine , polymer solar cell , materials science , carbazole , energy conversion efficiency , active layer , open circuit voltage , conjugated system , polymer chemistry , band gap , polymer , photochemistry , short circuit , chemical engineering , optoelectronics , layer (electronics) , organic chemistry , chemistry , nanotechnology , molecule , voltage , thin film transistor , physics , quantum mechanics , composite material , engineering
A new alternating conjugated polymer (PTCDPP) of carbazole‐substituted triarylamine and diketopyrrolopyrrole is prepared and characterized in detail. The polymer exhibits two strong absorption bands at 345 and 600 nm. With highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of −5.13 eV and −3.67 eV, PTCDPP displays an energy gap of 1.66 eV. PTCDPP‐based bulk heterojunction solar cells with a structure of fluorinated tin oxide (FTO)/TiO 2 /PTCDPP:[6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM)/MoO 3 /Ag are fabricated. The devices are optimized by adjusting the composition of the PTCDPP:PCBM active layer, thermal treatment, and addition of processing additives. The device based on PTCDPP:PCBM (1:4, w/w) shows a power conversion efficiency (PCE) of 2.31%, with a short‐circuit current of 4.17 mA cm −2 , an open‐circuit voltage of 0.79 V, and a fill factor of 0.35. The best cell performance (2.65% PCE) is achieved by using 1,8‐diiodooctane (3%, v/v) as a processing additive and annealing the active layer at 80 °C.