Revealing the Charge Transfer Dynamics Between Singlet Fission Molecule and Hybrid Perovskite Nanocrystals

TL;DR

This study investigates the charge transfer dynamics between singlet fission molecules and perovskite nanocrystals, revealing rapid charge transfer that could enhance photovoltaic device performance.

Contribution

It provides new insights into the charge transfer mechanisms in singlet fission-perovskite composites using transient absorption spectroscopy.

Findings

Significant charge transfer occurs within picoseconds.

Shortened lifetime indicates efficient charge transfer.

Mechanistic understanding aids photovoltaic development.

Abstract

Singlet fission process has gained considerable attention because of its potential to enhance photovoltaic efficiency and break the Shockley Queisser limit. In photovoltaic devices perovskite materials have shown tremendous progress in the last decade. Therefore combining the singlet fission materials in perovskite devices can lead to a drastic enhancement in their performance. To reveal the applicability of singlet fission processes in perovskite materials we have investigated the charge transfer dynamics from an SF active material 910 bis phenylethynyl anthracene to CH3NH3PbBr3 perovskite nanocrystals using the transient absorption spectroscopy. We observed a significant charge transfer from the coupled triplet state of BPEA to conduction band of CH3NH3PbBr3 in picosecond timescale. The observation of shortened lifetime in a mixture of BPEA and CH3NH3PbBr3 nanocrytals confirms the significant charge transfer between these systems. Our study reveals the charge transfer mechanism in singlet fission perovskite composite which will help to develop an advanced photovoltaic system.