Gradient Doping in Sn-Pb Perovskites by Barium Ions for Efficient Single-Junction and Tandem Solar Cells

© 2022 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 16 vom: 01. Apr., Seite e2110351
1. Verfasser: Yu, Zhenhua (VerfasserIn)
Weitere Verfasser: Chen, Xihan, Harvey, Steven P, Ni, Zhenyi, Chen, Bo, Chen, Shangshang, Yao, Canglang, Xiao, Xun, Xu, Shuang, Yang, Guang, Yan, Yanfa, Berry, Joseph J, Beard, Matthew C, Huang, Jinsong
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article Sn-Pb perovskite solar cells all-perovskite tandem solar cells gradient n-doping by barium homojunctions ununiform distribution
Beschreibung
Zusammenfassung:© 2022 Wiley-VCH GmbH.
Narrow-bandgap (NBG) tin (Sn)-lead (Pb) perovskites generally have a high density of unintentional p-type self-doping, which reduces the charge-carrier lifetimes, diffusion lengths, and device efficiencies. Here, a p-n homojunction across the Sn-Pb perovskite is demonstrated, which results from a gradient doping by barium ions (Ba2+ ). It is reported that 0.1 mol% Ba2+ can effectively compensate the p-doping of Sn-Pb perovskites or even turns it to n-type without changing its bandgap. Ba2+ cations are found to stay at the interstitial sites and work as shallow electron donor. In addition, Ba2+ cations show a unique heterogeneous distribution in perovskite film. Most of the barium ions stay in the top 600 nm region of the perovskite films and turn it into weakly n-type, while the bottom portion of the film remains as p-type. The gradient doping forms a homojunction from top to bottom of the perovskite films with a built-in field that facilitates extraction of photogenerated carriers, resulting in an increased carrier extraction length. This strategy enhances the efficiency of Sn-Pb perovskite single-junction solar cells to over 21.0% and boosts the efficiencies of monolithic perovskite-perovskite tandem solar cells to 25.3% and 24.1%, for active areas of 5.9 mm2  and 0.94 cm2 , respectively
Beschreibung:Date Revised 21.04.2022
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202110351