Unveiling charge-transfer dynamics at singlet fission layer/hybrid perovskite interface

Unveiling charge-transfer dynamics at singlet fission layer/hybrid perovskite interface

Singlet fission (SF) materials have been applied in various types of solar cells to pursue higher power conversion efficiency (PCE) beyond the Shockley-Queisser (SQ) limit. SF implementation in perovskite solar cells has not been successfully realized yet due to the insufficient understanding of the...

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Bibliographic Details
Main Authors: Xiao, Xingchi, Cheng, Liang, Bao, Di, Tan, Qi Ying, Salim, Teddy, Soci, Cesare, Chia, Elbert E. M., Lam, Yeng Ming
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
Subjects:
Engineering::Materials
Singlet Fission
Perovskite
Online Access:https://hdl.handle.net/10356/171405
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Institution: Nanyang Technological University
Language: English
Description
Summary:Singlet fission (SF) materials have been applied in various types of solar cells to pursue higher power conversion efficiency (PCE) beyond the Shockley-Queisser (SQ) limit. SF implementation in perovskite solar cells has not been successfully realized yet due to the insufficient understanding of the SF/perovskite heterojunctions. In this work, we attempt to elucidate the charge dynamics of an SF/perovskite system by incorporating a well-known SF molecule, TIPS-pentacene, and a triple-cation perovskite Cs0.05(FA0.85MA0.15)0.95PbI2.55Br0.45, owing to their well-matched energy structures. The transient absorption spectra and kinetic fitting plots suggest an electron-transfer process from the triplet state of TIPS-pentacene to perovskite in the picosecond regime, which increases the carrier density by 20% in the perovskite layer. This work confirms the existence of an electron-transfer process between the SF material and perovskite, providing a pathway to SF-enhanced perovskite solar cells.

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