Cui Yong, Yao Hui-feng, Yang Chen-yi, Zhang Shao-qing, Hou Jian-hui. Organic Solar Cells with an Efficiency Approaching 15%. [J]. Acta Polymerica Sinica (2):223-230(2018)
DOI:
Cui Yong, Yao Hui-feng, Yang Chen-yi, Zhang Shao-qing, Hou Jian-hui. Organic Solar Cells with an Efficiency Approaching 15%. [J]. Acta Polymerica Sinica (2):223-230(2018) DOI: 10.11777/j.issn1000-3304.2018.17297.
Organic Solar Cells with an Efficiency Approaching 15%增强出版
we focus on the fine-tuning of absorption spectra to achieve well-matched light response and reducing the energy loss (
E
loss
=
E
g
opt
-e
*
V
OC
where
E
g
opt
is the optical bandgap
and
V
OC
is the open circuit voltage) for the sub-cells of tandem organic solar cells (OSCs) to improve photovoltaic performance. We select PTB7-Th:IEICO-4F with a band gap of 1.24 eV as the rear cell and J52-2F:IT-M with a band gap of 1.59 eV as the front cell to fabricate the tandem OSCs. The absorption spectra of PTB7-Th:IEICO-4F is mainly located in the region of 600-950 nm
while that of J52-2F:IT-M is mainly located in the region of 450-750 nm. Their response spectra are very complementary
and both of the sub-cells show high external quantum efficiency
prompting the tandem OSCs to realize high-efficiency utilization of solar spectrum in the range of 300-1000 nm. In this tandem OSC
the
E
loss
in both front and rear cells are also effectively controlled to be 0.64 and 0.53 eV
respectively. In addition
an efficient interconnection layer (ICL) of ZnO/PCP-Na is used to connect the front and the rear sub-cells
which shows outstanding diode characteristics and high light transmittance in the long wavelength direction. In view of these excellent properties
the tandem solar cells manufactured in this work possess the advantages of high short-circuit current density (
J
SC
) and
V
OC
reaching 13.3 mA/cm
2
and 1.65 V
respectively. The highest power conversion efficiency (PCE) of the tandem OSC reaches 14.9%. The device parameters decrease slightly after encapsulation due to the intense ultraviolet irradiation
and a certified PCE of 14.0%
with a
V
OC
of 1.64 V
a
J
SC
of 12.9 mA/cm
2
and a fill factor (FF) of 0.664
recorded by National Institute of Metrology (NIM)
China. This result is the best obtained in the organic photovoltaic field.
关键词
有机太阳能电池聚合物太阳能电池非富勒烯叠层器件能量转换效率
Keywords
Organic solar cellsPolymer solar cellsNon-fullerene acceptorTandem solar cellHigh performance
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