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Donor–Acceptor‐Type Copolymers Based on a Naphtho[1,2‐c:5,6‐c]bis(1,2,5‐thiadiazole) Scaffold for High‐Efficiency Polymer Solar Cells
Author(s) -
Liu LiQian,
Zhang GuiChuan,
Liu Peng,
Zhang Jie,
Dong Sheng,
Wang Ming,
Ma YuGuang,
Yip HinLap,
Huang Fei
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402019
Subject(s) - fluorene , materials science , conjugated system , acceptor , polymer solar cell , polymer , copolymer , polymer chemistry , polymerization , carbazole , energy conversion efficiency , band gap , electron acceptor , photochemistry , chemistry , optoelectronics , physics , composite material , condensed matter physics
Four donor–acceptor‐type low‐bandgap conjugated polymers based on a naphtho[1,2‐c:5,6‐c]bis(1,2,5‐thiadiazole) (NT) acceptor and different donors bridged by a bithiophene spacer have been synthesized through Suzuki or Stille polymerization reactions. Fluorene (F), carbazole (Cz), alkylidene fluorene (AF), and benzodithiophene (BDT) were selected as the donor units to produce a series of new conjugated polymers. Owing to the different electron‐donating ability of the donor units, the energy levels, absorption spectra, bandgaps, and carrier mobilities of the resulting polymers were systematically tuned. Bulk‐heterojunction‐type polymer solar cells based on the new polymers and [6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (PC 61 BM) or [6,6]‐phenyl‐C 71 ‐butyric acid methyl ester (PC 71 BM) were investigated and all of the devices exhibited good photovoltaic performance, with power‐conversion efficiencies (PCEs) over 3 %. The best device performance was achieved by PF‐C12NT , with an open‐circuit voltage ( V oc ) of 0.87 V, a short‐circuit current density ( J sc ) of 12.19 mA cm −2 , a fill factor (FF) of 61.36 %, and a PCE of 6.51 % under simulated sunlight (100 mW cm −2 , AM 1.5G).