Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions

Tasnuva Hamid; Soniya D. Yambem; Ross Crawford; Jonathan Roberts; Ajay K. Pandey

doi:10.1117/12.2273804

25 August 2017 Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions

Tasnuva Hamid, Soniya D. Yambem, Ross Crawford, Jonathan Roberts, Ajay K. Pandey

Author Affiliations +

Proceedings Volume 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII; 1036307 (2017) https://doi.org/10.1117/12.2273804
Event: SPIE Organic Photonics + Electronics, 2017, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Tasnuva Hamid, Soniya D. Yambem, Ross Crawford, Jonathan Roberts, and Ajay K. Pandey "Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions", Proc. SPIE 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII, 1036307 (25 August 2017); https://doi.org/10.1117/12.2273804

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