Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33725
Title: Charge dynamics in solar cells with a blend of pi-conjugated polymer-fullerene studied by transient photo-generated voltage
Authors: Ding, BF
Choy, WCH
Kwok, WM 
Wang, CD
Ho, KYF
Fung, DDS
Xie, FX
Issue Date: 2012
Publisher: Royal Society of Chemistry
Source: Physical chemistry chemical physics, 2012, v. 14, no. 23, p. 8397-8402 How to cite?
Journal: Physical chemistry chemical physics 
Abstract: The biphasic feature of transient photo-generated voltage (TPV) is investigated in organic solar cells (OSCs) with a blend active layer of poly(3-hexylthiophene) (P3HT) and phenyl C61 butyric acid methyl ester (PCBM). The positive and negative components in biphasic TPV are explained through PCBM only and P3HT only devices. The negative and positive components are ascribed to the dipole formation at the buried interface of P3HT/indium tin oxide (ITO) and PCBM/ITO respectively. Based on these findings, two fundamental phenomena are revealed as follows: (1) interfacial modification on the buried interface inverts the negative component in biphasic TPV to a positive component, which prevents the leakage current channel in the conventional OSC structure; and (2) the solvent chosen transforms the positive component in biphasic TPV into a negative signal, which blocks the leakage current channel in the inverted OSC structure. Consequently, the study of TPV polarity provides the justification of the interaction at the buried interface. Besides, the decay of TPV is found to be bi-exponential, which can be used as a tool to estimate the degree of charge balance in OSCs.
URI: http://hdl.handle.net/10397/33725
ISSN: 1463-9076
EISSN: 1463-9084
DOI: 10.1039/c2cp40911a
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