Efficient Charge Transfer in MAPbI3 QDs/TiO2 Heterojunctions for High-Performance Solar Cells

Methylammonium lead iodide (MAPbI(3)) perovskite quantum dots (QDs) have become one of the most promising materials for optoelectronics. Understanding the dynamics of the charge transfer from MAPbI(3) QDs to the charge transport layer (CTL) is critical for improving the performance of MAPbI(3) QD photoelectronic devices. However, there is currently less consensus on this. In this study, we used an ultrafast transient absorption (TA) technique to investigate the dynamics of charge transfer from MAPbI(3) QDs to CTL titanium dioxide (TiO2), elucidating the dependence of these kinetics on QD size with an injection rate from 1.6 x 10(10) to 4.3 x 10(10) s(-1). A QD solar cell based on MAPbI(3)/TiO2 junctions with a high-power conversion efficiency (PCE) of 11.03% was fabricated, indicating its great potential for application in high-performance solar cells.

Automated summary

This study used an ultrafast transient absorption technique to investigate the dynamics of charge transfer from MAPbI(3) quantum dots to the titanium dioxide charge transport layer. The results showed that the kinetics of this process depend on the size of the quantum dots. Additionally, a QD solar cell based on the MAPbI(3)/TiO2 junctions was fabricated, achieving a high power conversion efficiency of 11.03%, indicating its potential for high-performance solar cells.