TY - JOUR
T1 - Enhancing PbS colloidal quantum dot tandem solar cell performance by graded band alignment
AU - Gao, Yijun
AU - Zheng, Jianghui
AU - Chen, Weijian
AU - Yuan, Lin
AU - Teh, Zhi Li
AU - Yang, Jianfeng
AU - Cui, Xin
AU - Conibeer, Gavin
AU - Patterson, Robert
AU - Huang, Shujuan
PY - 2019/10/3
Y1 - 2019/10/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072846077&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/DP14140102073
U2 - 10.1021/acs.jpclett.9b02423
DO - 10.1021/acs.jpclett.9b02423
M3 - Article
C2 - 31510742
AN - SCOPUS:85072846077
SN - 1948-7185
VL - 10
SP - 5729
EP - 5734
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 19
ER -