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Proceedings Paper

Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions
Author(s): Tasnuva Hamid; Soniya D. Yambem; Ross Crawford; Jonathan Roberts; Ajay K. Pandey
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Paper Abstract

Singlet exciton fission is a process where an excited singlet state splits into two triplets, thus leading to generation of multiple excitons per absorbed photon in organic semiconductors. Herein, we report a detailed exciton management approach for multiexciton harvesting over a broadband region of the solar spectrum in singlet fission sensitized organic photodiodes. Through systematic studies on the model cascade of pentacene/rubrene/C60, we found that efficient photocurrent generation from pentacene can still occur despite the presence of a >10nm thick interlayer of rubrene in between the pentacene/C60 heterojunction. Our results show that thin rubrene interlayers of thickness < 5 nm are effective in maintaining the delicate balance between two free charge generation channels that progress independently via the electron and hole transfer routes. The contribution to photocurrent from pentacene despite having a reasonably thick rubrene interlayer, that too with higher triplet energy (T1=1.12 eV) than pentacene (T1= 0.86 eV), makes its operation a rather interesting result. We discuss the role of rubrene interlayer film discontinuity, triplet exciton reflection from rubrene interlayer and triplet energy transfer from rubrene to pentacene layer followed by diffusion of triplet excitons through rubrene as plausible mechanisms that would enable triplet excitons from pentacene to generate significant photocurrent in a multilayer organic heterojunction.

Paper Details

Date Published: 25 August 2017
PDF: 8 pages
Proc. SPIE 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII, 1036307 (25 August 2017); doi: 10.1117/12.2273804
Show Author Affiliations
Tasnuva Hamid, Queensland Univ. of Technology (Australia)
Soniya D. Yambem, Queensland Univ. of Technology (Australia)
Ross Crawford, Queensland Univ. of Technology (Australia)
Jonathan Roberts, Queensland Univ. of Technology (Australia)
Ajay K. Pandey, Queensland Univ. of Technology (Australia)

Published in SPIE Proceedings Vol. 10363:
Organic, Hybrid, and Perovskite Photovoltaics XVIII
Zakya H. Kafafi; Paul A. Lane; Kwanghee Lee, Editor(s)

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