Band unpinning and photovoltaic model for P3HT:PCBM organic bulk heterojunctions under illumination
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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http://dx.doi.org/10.1016/j.cplett.2008.09.035 |
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Title
Band unpinning and photovoltaic model for P3HT:PCBM organic bulk heterojunctions under illuminationAuthor (s)
Date
2008Publisher
ElsevierISSN
92614Bibliographic citation
Chemical Physics Letters, 465, p. 57-62Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionAbstract
Capacitance analysis of P3HT:PCBM bulk heterojunction solar cells, in dark and under illumination, shows a linear Mott-Schottky characteristic at moderate reverse bias, indicating p-doping of the organic blend. The ... [+]
Capacitance analysis of P3HT:PCBM bulk heterojunction solar cells, in dark and under illumination, shows a linear Mott-Schottky characteristic at moderate reverse bias, indicating p-doping of the organic blend. The flatband potential under illumination is displaced negatively about 0.6 V with respect to dark conditions. A basic photovoltaic model is developed to explain this, in terms of electron transfer via surface states at the metal/organic interface. Surface states with a slow exchange kinetics, become charged under illumination, unpinning the band and decreasing the depletion layer at the electron extraction contact. This becomes a major factor limiting the performance of bulk heterojunction solar cells. © 2008 Elsevier B.V. All rights reserved. [-]
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