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Probing Dark Exciton Diffusion Using Photovoltage

Probing Dark Exciton Diffusion Using Photovoltage

Tyler K Mullenbach, Ian J Curtin, Tao Zhang, Russell J Holmes

Nat Commun. 2017 Jan 27;8:14215.

PMID: 28128206

Abstract:

The migration of weakly and non-luminescent (dark) excitons remains an understudied subset of exciton dynamics in molecular thin films. Inaccessible via photoluminescence, these states are often probed using photocurrent methods that require efficient charge collection. Here we probe exciton harvesting in both luminescent and dark materials using a photovoltage-based technique. Transient photovoltage permits a real-time measurement of the number of charges in an organic photovoltaic cell, while avoiding non-geminate recombination losses. The extracted exciton diffusion lengths are found to be similar to those determined using photocurrent. For the luminescent material boron subphthalocyanine chloride, the photovoltage determined diffusion length is less than that extracted from photoluminescence. This indicates that while photovoltage circumvents non-geminate losses, geminate recombination at the donor-acceptor interface remains the primary recombination pathway. Photovoltage thus offers a general approach for extracting a device-relevant diffusion length, while also providing insight in to the dominant carrier recombination pathways.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP36530060	Boron subphthalocyanine chloride		36530-06-0	Price

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