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A New Figure of Merit for Organic Solar Cells with Transport-limited Photocurrents

  • Compared to their inorganic counterparts, organic semiconductors suffer from relatively low charge carrier mobilities. Therefore, expressions derived for inorganic solar cells to correlate characteristic performance parameters to material properties are prone to fail when applied to organic devices. This is especially true for the classical Shockley-equation commonly used to describe current-voltage (JV)-curves, as it assumes a high electrical conductivity of the charge transporting material. Here, an analytical expression for the JV-curves of organic solar cells is derived based on a previously published analytical model. This expression, bearing a similar functional dependence as the Shockley-equation, delivers a new figure of merit α to express the balance between free charge recombination and extraction in low mobility photoactive materials. This figure of merit is shown to determine critical device parameters such as the apparent series resistance and the fill factor.

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Author:Dieter NeherORCiDGND, Juliane Kniepert, Arik Elimelech, L. Jan Anton Koster
ISSN:2045-2322 (online)
Parent Title (English):Scientific reports
Publisher:Nature Publishing Group
Place of publication:London
Document Type:Article
Date of first Publication:2016/04/26
Year of Completion:2016
Publishing Institution:Universität Potsdam
Release Date:2016/06/09
Tag:Electronic and spintronic devices; Semiconductors
Funder:Universität Potsdam, Publikationsfonds
Grant Number:PA 2016_16
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Dewey Decimal Classification:0 Informatik, Informationswissenschaft, allgemeine Werke / 00 Informatik, Wissen, Systeme / 004 Datenverarbeitung; Informatik
Peer Review:Referiert
Grantor:Publikationsfonds der Universität Potsdam
Publication Way:Open Access
Licence (German):License LogoCreative Commons - Namensnennung, 4.0 International
Notes extern:Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 225