Dithieno[2,3‐d:2',3'‐d']benzo[1,2‐b:4,5‐b']dithiophene (DTBDAT)‐based copolymers for high‐performance organic solar cells

Abstract

P(BDT-TCNT) and P(DTBDAT-TCNT), which has an extended conjugation length, were designed and synthesized for applications in organic solar cell (OSCs). The solution absorption maxima of P(DTBDAT-TCNT) with the extended conjugation were red-shifted by 5-15 nm compared with those of P(BDT-TCNT). The optical band gaps and highest occupied molecular orbital (HOMO) energy levels of both P(BDT-TCNT) and P(DTBDAT-TCNT) were similar. The structure properties of thin films of these materials were characterized using grazingincidence wide-angle X-ray scattering and tapping-mode atomic force microscopy, and charge carrier mobilities were characterized using the space-charge limited current method. OSCs were formed using [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) as the electron acceptor and 3% diphenylether as additive suppress aggregation. OSCs with P(BDT-TCNT) as the electron donor exhibited a power conversion efficiency (PCE) of 4.10% with a short-circuit current density of J SC 5 9.06 mA/ cm 2 , an open-circuit voltage of V OC 5 0.77 V, and a fill factor of FF 5 0.58. OSCs formed using P(DTBDAT-TCNT) as the electron donor layer exhibited a PCE of 5.83% with J SC 5 12.2 mA/cm 2 , V OC 5 0.77 V, and FF 5 0.62. V C 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 3182-3192

Carrier Charge Polarity in Mixed-Stack Charge-Transfer Crystals Containing Dithienobenzodithiophene

“…Although many thienoacenes have been investigated, − recently, dithieno­[2,3- d ;2′3′- d ′]­benzo­[1,2- b ;4,5- b ′]­dithiophene (DTBDT, Scheme ) has attracted attention as a donor component in D–A polymers. − The alkyl derivative (C 6 DTBDT) also shows as high mobility as 1.7 cm 2 V –1 s –1 . The TCNQ and F 4 TCNQ complexes have been reported, but the transistor properties are not investigated.…”

New Fused Pyrrolopyridine‐Based Copolymers for Organic Solar Cell

“…Although great effort has been expended to develop new donor materials, designs for donor and acceptor units are limited. The donor unit materials for D–A copolymers includes benzothiadiazole (BDT), dibenzo[b,b′]thieno[2,3‐f:5,4‐f′]bis[1]benzothiophene (DBTBT), carbazole, dialkoxy naphthalene, dialkoxy phenylene, thiophene and naphtha[2,1‐b:3,4‐b’]dithiophene, and phenanthro[1,10,9,8‐cdefg]carbazole …”