TY - JOUR
T1 - Perovskite solar cells with embedded homojunction via nonuniform metal ion doping
AU - Lin, Yuze
AU - Li, Tao
AU - Liu, Ye
AU - Bahrami, Behzad
AU - Guo, Dengyang
AU - Fang, Yanjun
AU - Shao, Yuchuan
AU - Chowdhury, Ashraful Haider
AU - Wang, Qi
AU - Deng, Yehao
AU - Gruverman, Alexei
AU - Savenije, Tom J.
AU - Qiao, Qiquan
AU - Huang, Jinsong
N1 - Funding Information:
The work is financially supported by the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science within the US Department of Energy, and the National Science Foundation through the Nebraska Materials Research Science and Engineering Center (MRSEC) (grant no. DMR-1420645). J.H. conceived the idea. J.H. and Y. Lin designed the experiments. Y. Lin fabricated and characterized the solar cells. T.L. and A.G. conducted the KPFM characterization. Y. Liu contributed to fabricating and polishing the thin film samples. B.B. A.H.C. and Q.Q. conducted the TP-AFM characterization. D.G. and T.J.S. conducted the TRMC characterization. Y.F. Y. Liu, and Y.S. conducted the PL and TRPL characterizations. Q.W. contributed to the EQEEL measurement. Y.D. fabricated the blade-coated thin films. J.H. and Y. Lin wrote the paper. All of the authors reviewed the paper. J.H. is a board member of Cell Reports Physical Science. J.H. and Y. Lin are inventors on a patent application related to this work filed by the University of North Carolina, Chapel Hill. The other authors declare no competing interests.
Funding Information:
The work is financially supported by the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science within the US Department of Energy , and the National Science Foundation through the Nebraska Materials Research Science and Engineering Center (MRSEC) (grant no. DMR-1420645 ).
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/5/19
Y1 - 2021/5/19
N2 - A long photoluminescence decay lifetime has been regarded as a generic indication of long charge carrier recombination lifetime in semiconductors such as metal halide perovskites (MHPs), which have shown tremendous success in solar cells. Here, we report that MHP polycrystalline films with extrinsic metal ions have a very long charge recombination lifetime, but a much shorter photoluminescence decay lifetime, and this huge difference can be explained by a model of lateral homojunction within each individual grain. The lateral homojunction is formed due to the doping along grain boundaries by metal ions, and then verified by nanoscale potential mapping and transient photo-response mapping. The built-in electric field within each grain reduces the recombination of free charge carriers within the perovskite grain and along grain boundaries, while the free electrons and holes are collected to cathode and anode through the grain boundaries and grain interiors, respectively. Then, the efficiencies of MHP polycrystalline solar cells are increased.
AB - A long photoluminescence decay lifetime has been regarded as a generic indication of long charge carrier recombination lifetime in semiconductors such as metal halide perovskites (MHPs), which have shown tremendous success in solar cells. Here, we report that MHP polycrystalline films with extrinsic metal ions have a very long charge recombination lifetime, but a much shorter photoluminescence decay lifetime, and this huge difference can be explained by a model of lateral homojunction within each individual grain. The lateral homojunction is formed due to the doping along grain boundaries by metal ions, and then verified by nanoscale potential mapping and transient photo-response mapping. The built-in electric field within each grain reduces the recombination of free charge carriers within the perovskite grain and along grain boundaries, while the free electrons and holes are collected to cathode and anode through the grain boundaries and grain interiors, respectively. Then, the efficiencies of MHP polycrystalline solar cells are increased.
KW - charge carrier recombination
KW - grain boundary doping
KW - lateral homojunction
KW - metal ion
KW - nonuniform doping
KW - perovskite solar cell
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U2 - 10.1016/j.xcrp.2021.100415
DO - 10.1016/j.xcrp.2021.100415
M3 - Article
AN - SCOPUS:85106304097
SN - 2666-3864
VL - 2
JO - Cell Reports Physical Science
JF - Cell Reports Physical Science
IS - 5
M1 - 100415
ER -