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Regulated Crystallization Through Intermolecular Interactions Bridging for Efficient Tin-Based Perovskite Solar

Chengjian Yuan¹, Junfang Wang^1,2, Yuqian Yang¹

¹School of Microelectronics, University of Science and Technology of China, No. 96, Jinzhai Road, Hefei, Anhui, 230026, China.

Small (Weinheim an Der Bergstrasse, Germany)

|February 25, 2025

Summary

This summary is machine-generated.

Methyl carbazate (MeC) addition improves tin halide perovskite (THP) solar cells by controlling crystallization and reducing defects. This strategy enhances power conversion efficiency and stability in lead-free THP devices.

Keywords:

cyrstallization kinetics in situ characterization perovskite solar cells tin‐based perovskite

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Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Tin halide perovskites (THPs) are promising lead-free materials for solar energy conversion.
Rapid crystallization and Sn2+ oxidation in THPs cause poor film morphology and defects, limiting efficiency and stability.

Purpose of the Study:

To develop a crystallization regulation strategy for THP solar cells using methyl carbazate (MeC).
To improve the morphology, efficiency, and stability of THP films by controlling crystallization kinetics.

Main Methods:

Introducing methyl carbazate (MeC) into the perovskite precursor solution.
Investigating intermolecular interactions (coordination and hydrogen bonds) between MeC and perovskite.
Analyzing the impact of MeC on Sn2+ oxidation, crystallization kinetics, and defect density.

Main Results:

MeC formation of coordination and hydrogen bonds stabilized the perovskite lattice and suppressed Sn2+ oxidation.
MeC enhanced nucleation sites, controlling fast crystallization and improving film morphology.
MeC reduced deep-level trap state defects, suppressing non-radiative recombination and extending carrier lifetime.

Conclusions:

Methyl carbazate offers a facile strategy to regulate THP crystallization, enhancing film quality.
This approach significantly boosts THP solar cell power conversion efficiency from 10.43% to 14.02% with improved stability.