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A Shockley-Type Polymer: Fullerene Solar Cell

Ardalan Armin Orcid Logo, Zhiming Chen, Yaocheng Jin, Kai Zhang, Fei Huang, Safa Shoaee

Advanced Energy Materials, Volume: 8, Issue: 7, Start page: 1701450

Swansea University Author: Ardalan Armin Orcid Logo

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DOI (Published version): 10.1002/aenm.201701450

Abstract

Charge extraction rate in solar cells made of blends of electron donating/accepting organic semiconductors is typically slow due to their low charge carrier mobility. This sets a limit on the active layer thickness and has hindered the industrialization of organic solar cells (OSCs). Herein, charge...

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Published in: Advanced Energy Materials
ISSN: 1614-6832
Published: Wiley 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa38452
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Abstract: Charge extraction rate in solar cells made of blends of electron donating/accepting organic semiconductors is typically slow due to their low charge carrier mobility. This sets a limit on the active layer thickness and has hindered the industrialization of organic solar cells (OSCs). Herein, charge transport and recombination properties of an efficient polymer (NT812):fullerene blend are investigated. This system delivers power conversion efficiency of >9% even when the junction thickness is as large as 800 nm. Experimental results indicate that this material system exhibits exceptionally low bimolecular recombination constant, 800 times smaller than the diffusion-controlled electron and hole encounter rate. Comparing theoretical results based on a recently introduced modified Shockley model for fill factor, and experiments, clarifies that charge collection is nearly ideal in these solar cells even when the thickness is several hundreds of nanometer. This is the first realization of high-efficiency Shockley-type organic solar cells with junction thicknesses suitable for scaling up.
Keywords: Organic solar cells, reduced recombination, charge carrier mobility, organic semiconductors
College: College of Science
Issue: 7
Start Page: 1701450