Fine Tuning of Open-Circuit Voltage by Chlorination
in Thieno[3,4‑b]thiophene–Benzodithiophene
Terpolymers toward Enhanced Solar Energy Conversion
Version 3 2017-06-29, 14:22
Version 2 2017-06-28, 13:52
Version 1 2017-06-27, 14:50
Posted on 2017-06-29 - 14:22
A new family of thieno[3,4-b]thiophene–benzodithiophene
terpolymers (PBTClx) have been designed and synthesized, in which
the chlorine/fluorine content has been adjusted and optimized. As
the content of chlorine is increased in polymers, the twist angle
between the donor and acceptor is increased, which leads to a diminishment
in the planarity and conjugation. As a result, the UV–vis absorption
is continuous blue-shifted, and the band gap increases from 1.57 to
2.04 eV when the chlorinated moieties increased from 0 to 100%. The
highest occupied molecular orbital (HOMO) levels of those polymers
are decreased by increasing the content of chlorinated moiety, which
opens a window to constantly modify the Voc values and eventually meets a balance point for optimized solar
energy conversion. The highest power conversion efficiency of 8.31%
is obtained by using PBTCl25 as the donor and PC71BM as the acceptor in polymer solar cells (PSCs), in which
the Voc increased from 0.79 to 0.82 V
after 25% chlorinated monomer involved in copolymerization. Herein,
the chlorine replacement could be a good method to further pump the
solar conversion by increasing the open circuit voltage without reducing
other factors of the polymer solar cells.
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Qu, Shiwei; Wang, Huan; Mo, Daize; Chao, Pengjie; Yang, Zhen; Li, Longji; et al. (2017). Fine Tuning of Open-Circuit Voltage by Chlorination
in Thieno[3,4‑b]thiophene–Benzodithiophene
Terpolymers toward Enhanced Solar Energy Conversion. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b00785
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AUTHORS (9)
SQ
Shiwei Qu
HW
Huan Wang
DM
Daize Mo
PC
Pengjie Chao
ZY
Zhen Yang
LL
Longji Li
LT
Leilei Tian
WC
Wei Chen
FH
Feng He
KEYWORDS
Fine Tuningcircuit voltagetwist angleenergy conversionpower conversion efficiencycontentthiopheneOpen-Circuit VoltagePC 71 BMbalance pointacceptorPSCUVEnhanced Solar Energy ConversionHOMOband gap increasesV oc0.82 Vpolymerchlorinated moietiesdonorPBTCl 25optimized2.04 eVV oc valueschlorine replacementchlorinated moiety