# Efficient Perovskite Solar Cell with Improved Electron Extraction Based on SnO2/Phosphorene Heterojunction as Electron Transport Layer

## TL;DR

This paper shows that adding phosphorene to the electron transport layer of perovskite solar cells improves efficiency by boosting electron mobility and reducing recombination.

## Contribution

The study introduces a SnO2/phosphorene heterojunction as a novel electron transport layer for perovskite solar cells.

## Key findings

- The SnO2/phosphorene composite increased energy conversion efficiency from 16.38% to 18.03%.
- Phosphorene reduced electron-hole recombination and series resistance in the solar cells.
- Electron mobility in the absorption layer was enhanced with phosphorene incorporation.

## Abstract

Due to its unique electrical and optical properties, as well as the tunable band structure based on thickness, 2D phosphorene recently emerged as a research hotspot and holds significant potential for applications across various fields. In this study, due to the special band structure and excellent electron transport performance of phosphorene, it formed a series structure with SnO2 as the electron transport layer of perovskite solar cells. Consequently, the photocurrent density was enhanced by approximately 20%, and the energy conversion efficiency was effectively elevated from 16.38% for pure SnO2 to 18.03% for the SnO2/phosphorene composite. Electrochemical measurements and spectral analyses revealed that the incorporation of phosphorene augmented electron mobility within the absorption layer, reduced the electron–hole recombination rate, and decreased the cell’s series resistance, thereby leading to improved efficiency of the perovskite solar cell. This research not only introduces a novel approach to enhancing solar cell efficiency but also paves a new pathway for the application of phosphorene.