Highly efficient perovskite solar cells with a compositionally engineered perovskite/hole transporting material interface

By K. Cho, S. Paek, G. Grancini, C. Roldán-Carmona, Peng Gao, Yong Hui Lee, Md. K. Nazeeruddin. 2017

374 citations recorded by the source corpus.

Perovskite solar cells (PSCs) have experienced an outstanding advance in power conversion efficiency (PCE) by optimizing the perovskite layer morphology, composition, interfaces, and charge collection efficiency. To enhance PCE, here we developed a new method i.e., engineering a compositional gradient thinly at the rear interface between the perovskite and the hole transporting materials. We demonstrate that charge collection is improved and charge recombination is reduced by formation of an engineered passivating layer, which leads to a striking enhancement in open-circuit voltage (VOC). The passivation effect induced by constructing an additional FAPbBr3−xIx layer on top of the primary (FAPbI3)0.85(MAPbBr3)0.15 film was proven to function as an electron blocking layer within the perovskite film, resulting in a final PCE of 21.3%. Our results shed light on the importance of the interfacial engineering on the rear surface of perovskite layers and describe an innovative approach that will further boost the PSC efficiency.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/39ba67323c87c1341afb5739437e7e2d4558c699

Citations in the corpus

• Selective growth of layered perovskites for stable and efficient photovoltaics (2018, neutral): “After building the thin 2D perovskite layer on CFMPIB films, the creation of band offset inside perovskite films is expected to cause an increase of charge transfer of photo-generated electrons to TiO2 and blocking the charge recombination at the interface of perovskite/HTL under illumination (26).”