Synthesis and photovoltaic properties low bandgap D-A copolymers based on fluorinated thiadiazoloquinoxalineстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 18 апреля 2017 г.

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[1] Synthesis and photovoltaic properties low bandgap d-a copolymers based on fluorinated thiadiazoloquinoxaline / M. L. Keshtov, A. R. Khokhlov, S. A. Kuklin et al. // Organic Electronics. — 2017. — Vol. 43. — P. 268–276. In this communication, we report the design a low bandgap D-A copolymer consist of fluorinated thiadiazoloquinoxaline (TDQ) as strong acceptor and benzothiophene (BT), denoted as P(ffFlTDQx-BT) exhibit broad absorption profile covering from 350 nm to 1000 nm with optical bandgap of 1.26 eV. P(ffFlTDQx-BT) showed highest occupied molecular orbital (HOMO) energy level of 5.46 eV which is deeper than that for nonfluorinated counterpart copolymer. The photovoltaic properties were evaluated using conventional devices with a structure of ITO/PEDOT:PSS/P(ffFlTDQx-BT):PC71BM/Al. After the optimizations of the P(ffFlTDQx-BT) to PC71BM weight ratios, and concentration of the solvent additive (DIO), the devices showed overall power conversion efficiency of 7.27%. The higher value of PCE of this device is higher than that of nonfluorinated copolymer (5.80%) is attributed to the higher values of both Jsc and FF, related to the higher hole mobility and better exciton dissociation efficiency. Moreover, employing a low boiling point solvent additive, i.e. o-chlorobenzaldehyde (CBA) (boiling point 132 C) for active layer deposition and after the optimization of concentration of CBA, the resulted PSC showed overall PCE of 8.10%, which is higher than the PSC based on active processed with DIO/CB, related to the better balanced charge transport, induced by the fast removal of residues of solvent. To our best of our knowledge, PCE of 8.10% is also the highest for the PSCs with low bandgap of below 1.30 eV. [ DOI ]

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