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Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction / Seyed Mehrdad Hosseini, Steffen Roland, Jona Kurpiers, Zhiming Chen, Kai Zhang, Fei Huang, Ardalan Armin, Dieter Neher, Safa Shoaee

The Journal of Physical Chemistry C, Volume: 123, Issue: 11, Pages: 6823 - 6830

Swansea University Author: Ardalan Armin

Abstract

Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present...

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Published in: The Journal of Physical Chemistry C
ISSN: 1932-7447 1932-7455
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa49632
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Abstract: Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present a comparative study of bulk heterojunction solar cells composed of a recently introduced nappthothiadiazole-based polymer (NT812) as the electron donor and two different acceptor molecules, namely PCBM[70] and ITIC. A comparison between photovoltaic performance of these two types of solar cells reveals that the open circuit voltage (Voc) of NT812:ITIC based solar cell is larger but the fill factor (FF) lower than that of NT812:PCBM[70] device. We find the key reason behind this reduced FF in the ITIC-based device to be faster non-geminate recombination relative to NT812:PCBM[70] system, which has previously been assigned to sub-optimum morphology. Nevertheless, NT812:ITIC system is more emissive than NT812:PCBM[70] resulting in smaller non-radiative Voc-loss. Suppression of bimolecular recombination together with reduced non-radiative Voc-loss can be considered as a key optimization route in the development of non-fullerene-based solar cells.
College: College of Science
Issue: 11
Start Page: 6823
End Page: 6830