Organic chemistry

Tandem

Crystallography

Hydrogen bond

Perovskite (structure)

Band gap

Composite material

Inorganic chemistry

Hydrazide

Chemistry

Chemical stability

Materials science

Hydrazine (antidepressant)

Layer (electronics)

Dangling bond

Molecule

Silicon

Passivation

Chromatography

Optoelectronics

Angewandte Chemie International Edition

All-inorganic CsPbI3 perovskite presents preeminent chemical stability and a desirable band gap as the front absorber for perovskite/silicon tandem solar cells. Unfortunately, CsPbI3 perovskite solar cells (PSCs) still show low efficiency due to high density of defects in solution-prepared CsPbI3 films. Herein, three kinds of hydrazide derivatives (benzoyl hydrazine (BH), formohydrazide (FH) and benzamide (BA)) are designed to reduce the defect density and stabilize the phase of CsPbI3 . Calculation and characterization results corroborate that the carboxyl and hydrazine groups in BH form strong chemical bonds with Pb2+ ions, resulting in synergetic double coordination. In addition, the hydrazine group in the BH also forms a hydrogen bond with iodine to assist the coordination. Consequently, a high efficiency of 20.47 % is achieved, which is the highest PCE among all pure CsPbI3 -based PSCs reported to date. In addition, an unencapsulated device showed excellent stability in ambient air.

Hydrazide Derivatives for Defect Passivation in Pure CsPbI<sub>3</sub> Perovskite Solar Cells

Hydrazide Derivatives for Defect Passivation in Pure CsPbI3 Perovskite Solar Cells

Hydrazide Derivatives for Defect Passivation in Pure CsPbI₃ Perovskite Solar Cells