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1.中国海洋大学材料科学与工程学院 青岛 266100
2.中国科学院青岛生物能源与过程研究所 青岛 266101
3.青岛科技大学高分子科学与工程学院 青岛 266042
Published:20 April 2018,
Received:7 May 2017,
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Jing Ren, Wei-ye Chen, Feng Li, Wei Wang, Ren-qiang Yang, Ming-liang Sun. Synthesis and Photovoltaic Performance of Low Band Gap Dithieno[3, 2-b:2', 3'-d]pyrrole-based Conjugated Copolymers. [J]. Acta Polymerica Sinica (4):456-463(2018)
Jing Ren, Wei-ye Chen, Feng Li, Wei Wang, Ren-qiang Yang, Ming-liang Sun. Synthesis and Photovoltaic Performance of Low Band Gap Dithieno[3, 2-b:2', 3'-d]pyrrole-based Conjugated Copolymers. [J]. Acta Polymerica Sinica (4):456-463(2018) DOI: 10.11777/j.issn1000-3304.2017.17124.
二噻吩[3,2-b:2',3'-d]并吡咯(Dithieno[3,2-b:2',3'-d]
pyrrole,DTP)分别与3种受体单元聚合得到聚合物
P1
~
P3
,受体单元分别为:吡咯并吡咯二酮(DPP)、二噻吩苯并噁二唑(DTBO)和喹喔啉衍生物(TQ).研究表明,3种聚合物都有较窄的带隙(
P1
:1.23 eV,
P2
:1.51 eV,
P3
:1.50 eV),有利于活性层材料对太阳光的吸收,其中
P1
获得了最宽的吸收(近1000 nm).将
P1
~
P3
与PC
71
BM共混制备光伏器件,当给受体比例为1:3时,基于
P1
的光伏器件短路电流密度(short-circuit current density,
J
SC
)为15.82 mA/cm
2
,开路电压(open-circuit voltage,
V
OC
)为0.38 V,能量转化效率(power conversion efficiency,PCE)达到3.33%,为3种聚合物中最高的效率.对于聚合物
P2
和
P3
,在给受体比例为1:2时,光伏性能最好,此时
P2
与
P3
的PCE值分别为1.20%和1.37%,导致较低光电转换效率的因素是短路电流密度
J
SC
(
P2
:9.70 mA/cm
2
,
P3
:9.21 mA/cm
2
)和开路电压
V
OC
(约0.3 V)过低.
In the polymer solar cells research field
dithieno[3
2-b:2'
3'-d]pyrrole (DTP) is a good donor unit due to its good planarity when it is used as build donor-acceptor (D-A) polymer. In this work
three DTP based polymers (named
P1
P2
P3
) are synthesized by polymerizing DTP with DPP
DTBO and TQ co-monomer acceptor unit
respectively. These three polymers exhibit good solubility in common solvent such as dichlorobenzene. GPC results show that the polymers show moderate number-average molecular weights (
M
n
9×10
3
to 2.2×10
4
) and narrow PDI (1-2). UV-Vis absorption spectra in solution and thin film show that the polymers have a relatively narrow band gap (
P1
:1.23 eV;
P2
:1.51 eV;
P3
:1.50 eV)
which enhances the polymer absorption of sunlight
with
P1
showing the widest absorption (extending UV-Vis absorption to nearly 1000 nm). The thermal property of these polymers is measured by thermogravimetric analysis (TGA)
giving their
T
d
located at 313-410℃. The highest occupied molecular orbital (HOMO) energy levels of the polymers are between -5.2 eV and -5.4 eV
as tested by CV method. Photovoltaic devices are fabricated with
P1
-
P3
as donor and PC
71
BM as acceptor in active layer. The solar cells
J
-
V
test results reveal that
P1
has the highest PCE of 3.33% with
J
SC
of 15.82 mA/cm
2
V
OC
of 0.38 V when the mass ratio of
P1
to PC
71
BM is kept at 1:3. The relative high PCE of
P1
based PSCs devices is due to the wide light absorption
leading to high
J
SC
of PSCs devices
which also can be confirmed by external quatum efficiency (EQE) test. For the polymers
P2
and
P3
with the mass ratio of polymer/PC
71
BM at 1:2
PCE of 1.20% for
P2
and 1.37% of
P3
are achieved respectively
and the relatively low PCE is caused by low short circuit current density (
J
SC
) (
P2
:9.70 mA/cm
2
P3
:9.21 mA/cm
2
) and the low open-circuit voltage (
V
OC
only around 0.3 V). Transmission electron microscopy is also used to explore the polymer solar cells active layer morphology
which correlates closely with the donor and the acceptor aggregations and the phase separation.
二噻吩[3 2-b:2' 3'-d]并吡咯共轭聚合物光伏材料聚合物太阳能电池
Dithieno[3 2-b:2' 3'-d]pyrroleConjugated polymerPhotovoltaic materialPolymer solar cells
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