Enhancing PbS Colloidal Quantum Dot Tandem Solar Cell
Performance by Graded Band Alignment
Version 2 2019-10-08, 14:38
Version 1 2019-09-13, 16:37
Posted on 2019-10-08 - 14:38
Colloidal
quantum dot solids are attractive candidates for tandem
solar cells because of their widely tunable bandgaps. However, the
development of the quantum dot tandem solar cell has lagged far behind
that of its single-junction counterpart. One of the fundamental problems
with colloidal quantum dot solar cells is the relatively small diffusion
length, which limits the quantum dot absorbing layer thickness and
hence the power conversion efficiency. In this research, guided by
optical modeling and utilizing a graded band alignment strategy, a
two-terminal monolithic solution-processed quantum dot tandem solar
cell has been successfully fabricated and a power conversion efficiency
of 6.8% has been achieved. The band grading approach utilized the
complementary tuning of work functions and band alignment through
judicious choices of the nanoparticle surface chemistry and quantum
dot confined size. This work demonstrates a general approach to improving
the efficiency for tandem thin-film solar cells.
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Gao, Yijun; Zheng, Jianghui; Chen, Weijian; Yuan, Lin; Teh, Zhi Li; Yang, Jianfeng; et al. (2019). Enhancing PbS Colloidal Quantum Dot Tandem Solar Cell
Performance by Graded Band Alignment. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.9b02423
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AUTHORS (10)
YG
Yijun Gao
JZ
Jianghui Zheng
WC
Weijian Chen
LY
Lin Yuan
ZT
Zhi Li Teh
JY
Jianfeng Yang
XC
Xin Cui
GC
Gavin Conibeer
RP
Robert Patterson
SH
Shujuan Huang