Cadmium‐Doping Slows Trap Emptying in Ambient‐Air Blade‐Coated Formamidinium Lead Iodide Perovskite Solar Cells

Formamidinium lead iodide (FAPbI3) in its α‐phase is among the most desirable perovskite compositions for solar cells. However, because of its transition into the yellow δ‐phase at room temperature, it is a challenge to process it in ambient air by scalable fabrication methods. Here the introduction...

Full description

Saved in:
Bibliographic Details
Published in:Advanced energy materials 2024-05, Vol.14 (17), p.n/a
Main Authors: Zhang, Dongyang, Khasnabis, Sutripto, Wang, Wanlong, Yeddu, Vishal, Moradi, Shahram, Awais, Muhammad, Nguyen, Hai‐Dang, Reinecke, Sean B., Haruta, Yuki, Godin, Robert, Tan, Furui, Saidaminov, Makhsud I.
Format: Article
Language:English
Subjects:
ambient air
blade coating
Cadmium
cadmium iodide
Doping
formamidinium lead iodide
Performance enhancement
Perovskites
Photovoltaic cells
Radiative recombination
Room temperature
Solar cells
Trapped charge
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Formamidinium lead iodide (FAPbI3) in its α‐phase is among the most desirable perovskite compositions for solar cells. However, because of its transition into the yellow δ‐phase at room temperature, it is a challenge to process it in ambient air by scalable fabrication methods. Here the introduction of a trace amount of cadmium (in the form of CdI2) to FAPbI3 is reported and found that it enhances the stability of the perovskite's black α‐phase polymorph, inhibits non‐radiative recombination events, leads to pin‐hole free compact surface morphology, and improves band energy alignment. The 0.6% Cd‐doped FAPbI3 solar cells show a champion efficiency of 22.7% for 0.049 cm2 and 16.4% for cm2‐scale pixels, which, to the best of the knowledge, are among the highest for air‐ambient fully blade‐coated pure FAPbI3 solar cells with an n‐i‐p architecture. Transient absorption microscopy measurements reveal that Cd doping reduces the number of trapped charges and increases their lifetimes, promoting charge accumulation and a higher photovoltage. The study sheds light on the potential of cadmium as a homovalent dopant for the stabilization and performance enhancement of FAPbI3 performance solar cells. This study demonstrates fully blade‐coated formamidinium lead iodide (FAPbI3) solar cells with a 22.7% champion power conversion efficiency. The photovoltage of the device is improved by slowing trap emptying in FAPbI3 with Cd doping.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.202303858