Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/10882
Title: | Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells | Authors: | VANDEWAL, Koen Tvingstedt, Kristofer GADISA, Abay Inganas, Olle MANCA, Jean |
Issue Date: | 2010 | Publisher: | AMER PHYSICAL SOC | Source: | PHYSICAL REVIEW B, 81(12) | Abstract: | The open-circuit voltage (V-oc) of polymer:fullerene bulk heterojunction solar cells is determined by the interfacial charge-transfer (CT) states between polymer and fullerene. Fourier-transform photocurrent spectroscopy and electroluminescence spectra of several polymer:fullerene blends are used to extract the relevant interfacial molecular parameters. An analytical expression linking these properties to V-oc is deduced and shown to be valid for photovoltaic devices comprising three commonly used conjugated polymers blended with the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). V-oc is proportional to the energy of the CT states E-CT. The energetic loss q Delta V between E-CT and qV(oc) vanishes when approaching 0 K. It depends linearly on T and logarithmically on illumination intensity. Furthermore q Delta V can be reduced by decreasing the electronic coupling between polymer and fullerene or by reducing the nonradiative recombination rate. For the investigated devices we find a loss q Delta V of similar to 0.6 eV at room temperature and under solar illumination conditions, of which similar to 0.25 eV is due to radiative recombination via the CT state and similar to 0.35 eV is due to nonradiative recombination. | Notes: | [Vandewal, Koen; Tvingstedt, Kristofer; Inganas, Olle] Linkoping Univ, COE, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden. [Vandewal, Koen; Gadisa, Abay; Manca, Jean V.] Hasselt Univ, IMEC IMOMEC, B-3590 Diepenbeek, Belgium. [Vandewal, Koen; Gadisa, Abay; Manca, Jean V.] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. koeva@ifm.liu.se | Document URI: | http://hdl.handle.net/1942/10882 | ISSN: | 1098-0121 | DOI: | 10.1103/PhysRevB.81.125204 | ISI #: | 000276248900077 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2011 |
Appears in Collections: | Research publications |
Show full item record
SCOPUSTM
Citations
450
checked on Sep 3, 2020
WEB OF SCIENCETM
Citations
730
checked on Oct 14, 2024
Page view(s)
98
checked on Nov 7, 2023
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.