Trivalent Europium-Doped CsCl Quantum Dots for MA-Free Perovskite Solar Cells with Inherent Bandgap through Lattice Strain Compensation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37390486.
- Also identified by DOI 10.1002/adma.202302393.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Cesium-formamidinium (Cs-FA) perovskites have garnered widespread interest owing to their excellent thermal- and photostability in achieving stable perovskite solar cells (PSCs). However, Cs-FA perovskite typically suffers from Cs<sup>+</sup> and FA<sup>+</sup> mismatches, affecting the Cs-FA morphology and lattice distortion, resulting in an enlarged bandgap (E<sub>g</sub> ). In this work, "upgraded" CsCl, Eu<sup>3+</sup> -doped CsCl quantum dots, are developed to solve the key issues in Cs-FA PSCs and also exploit the advantage of Cs-FA PSCs on stability. The introduction of Eu<sup>3+</sup> promotes the formation of high-quality Cs-FA films by adjusting the Pb-I cluster. CsCl:Eu<sup>3+</sup> also offsets the local strain and lattice contraction induced by Cs<sup>+</sup> , which maintains the inherent E<sub>g</sub> of FAPbI<sub>3</sub> and decreases the trap density. Finally, a power conversion efficiency (PCE) of 24.13% is obtained with an excellent short-circuit current density of 26.10 mA cm<sup>-2</sup> . The unencapsulated devices show excellent humidity stability and storage stability, and an initial PCE of 92.2% within 500 h under continuous light illumination, and bias voltage conditions is achieved. This study provides a universal strategy to address the inherent issues of Cs-FA devices and maintain the stability of MA-free PSCs to satisfy future commercial criteria.