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Title: | Varying polymer crystallinity in nanofiber poly(3-alkylthiophene): PCBM solar cells: Influence on charge-transfer state energy and open-circuit voltage | Authors: | VANDEWAL, Koen OOSTERBAAN, Wibren BERTHO, Sabine VRINDTS, Veerle GADISA, Abay LUTSEN, Laurence VANDERZANDE, Dirk MANCA, Jean |
Issue Date: | 2009 | Publisher: | AMER INST PHYSICS | Source: | APPLIED PHYSICS LETTERS, 95(12) | Abstract: | The effect of poly(3-alkylthiophene) (P3AT) crystallinity in (nanofiber P3AT):PCBM photovoltaic devices on the energy of the charge-transfer state (E-CT) and on the open-circuit voltage (V-oc) is investigated for poly(3-butythiophene), poly(3-pentylthiophene) and poly(3-hexylhiophene). P3AT crystallinity, expressed as the crystalline nanofiber mass fraction f to the total P3AT mass in the spin-coating dispersion, is varied between similar to 0.1 and similar to 0.9 by temperature control. E-CT, as obtained by Fourier-transform photocurrent spectroscopy decreased with f as E-CT=E-CT(0)-0.2f eV. Alkyl side-chain length only influences E-CT(0). V-oc relates to E-CT as V-oc=E-CT/q-0.6 V. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3232242] | Notes: | [Vandewal, Koen] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. IMEC IMOMEC, B-3590 Diepenbeek, Belgium. | Document URI: | http://hdl.handle.net/1942/9991 | ISSN: | 0003-6951 | e-ISSN: | 1077-3118 | DOI: | 10.1063/1.3232242 | ISI #: | 000270243800078 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2010 |
Appears in Collections: | Research publications |
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