Work

Synergistic defect passivation and energy band reconstruction via LiH 2 PO 4 additive for efficient inverted perovskite solar cells

Year: 2026

Type: article

Abstract: Inverted perovskite solar cells (PSCs) are fundamentally constrained by non-radiative recombination and energy-level mismatches. Herein, we introduce lithium dihydrogen phosphate (LiH 2 PO 4 ) as a multifunctional precursor additive to regulate the crystallization kinetics and electronic structure of perovskite films. We demonstrate that LiH 2 PO 4 not only promotes highly (100)-textured grain growth and passivates deep-level defects but also induces a global energy band reconstruction. By correlating x-ray photoelectron spectroscopies and ultraviolet photoelectron spectroscopies, we disclose that the anomalous, simultaneous increase in core-level binding energies originates from a Fermi-level-driven rigid band shift coupled with the formation of a robust interfacial dipole. This dual-action mechanism effectively suppresses non-radiative recombination and eliminates charge extraction barrier. Consequently, the optimized inverted PSCs achieve a champion power conversion efficiency of 24.11%, along with enhanced open-circuit voltage, fill factor, and long-term environmental stability.

Source: Nanotechnology

DOI: 10.1088/1361-6528/ae607f

Authors: Xiang Hong, Xinqian Xie, Chuiyu Li, Haiyan Li, Songwang Yang

Institutions: Chinese Academy of Sciences, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,325