Electron Transfer from Triplet State of TIPS-Pentacene Generated by Singlet Fission Processes to CH3NH3PbI3 Perovskite

Sangsu Lee; Daesub Hwang; Seok Il Jung; Dongho Kim

doi:10.1021/acs.jpclett.7b00072

Electron Transfer from Triplet State of TIPS-Pentacene Generated by Singlet Fission Processes to CH₃NH₃PbI₃ Perovskite

J Phys Chem Lett. 2017 Feb 16;8(4):884-888. doi: 10.1021/acs.jpclett.7b00072. Epub 2017 Feb 8.

Authors

Sangsu Lee¹, Daesub Hwang¹, Seok Il Jung¹, Dongho Kim¹

Affiliation

¹ Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University , Seoul 03722, Korea.

PMID: 28169550
DOI: 10.1021/acs.jpclett.7b00072

Abstract

To reveal the applicability of singlet fission processes in perovskite solar cell, we investigated electron transfer from TIPS-pentacene to CH₃NH₃PbI₃ (MAPbI₃) perovskite in film phase. Through the observation of the shorter fluorescence lifetime in TIPS-pentacene/MAPbI₃ perovskite bilayer film (5 ns) compared with pristine MAPbI₃ perovskite film (20 ns), we verified electron-transfer processes between TIPS-pentacene and MAPbI₃ perovskite. Furthermore, the observation of singlet fission processes, a faster decay rate, TIPS-pentacene cations, and the analysis of kinetic profiles of the intensity ratio between 500 and 525 nm in the TA spectra of the TIPS-pentacene/MAPbI₃ perovskite bilayer film indicate that electron transfer occurs from triplet state of TIPS-pentacene generated by singlet fission processes to MAPbI₃ perovskite conduction band. We believe that our results can provide useful information on the design of solar cells sensitized by singlet fission processes and pave the way for new types of perovskite solar cells.