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Issue 20, 2018
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Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics

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Abstract

In organic photovoltaic blends, there is a trade-off between exciton harvesting and charge extraction because of the short exciton diffusion length. Developing a way of increasing exciton diffusion length would overcome this trade-off by enabling efficient light harvesting from large domains. In this work, we engineered (enhanced) both exciton diffusion length and domain size using solvent vapour annealing (SVA). We show that SVA can give a three-fold enhancement in exciton diffusion coefficient (D) and nearly a doubling of exciton diffusion length. It also increases the domain size, leading to enhancement of charge extraction efficiency from 63 to 89%. Usually larger domains would reduce exciton harvesting but this is overcome by the large increase in exciton diffusion, leading to a 20% enhancement in device efficiency.

Graphical abstract: Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics

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Publication details

The article was received on 05 Feb 2018, accepted on 18 Apr 2018 and first published on 19 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01226A
Citation: J. Mater. Chem. A, 2018,6, 9445-9450
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    Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics

    M. T. Sajjad, O. Blaszczyk, L. K. Jagadamma, T. J. Roland, M. Chowdhury, A. Ruseckas and I. D. W. Samuel, J. Mater. Chem. A, 2018, 6, 9445
    DOI: 10.1039/C8TA01226A

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