Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/7423
Title: Determination of gap defect states in organic bulk heterojunction solar cells from capacitance measurements
Authors: Boix, Pablo P. 
García-Belmonte, Germà 
Neophytou, Marios 
Keywords: Heterojunctions;Capacitance meters;Solar cells
Category: Environmental Engineering
Field: Engineering and Technology
Issue Date: 2009
Publisher: AIP
Source: Applied Physics Letters, 2009, Volume 95, Issue 23, Pages 1-4
Abstract: Energy distributions [density-of-states (DOS)] of defects in the effective band gap of organic bulk heterojunctions are determined by means of capacitance methods. The technique consists of calculating the junction capacitance derivative with respect to the angular frequency of the small voltage perturbation applied to thin film poly(3-hexylthiophene) (P3HT) [6,6]-phenyl C61 -butyric acid methyl ester (PCBM) solar cells. The analysis, which was performed on blends of different composition, reveals the presence of defect bands exhibiting Gaussian shape located at E≈0.38 eV above the highest occupied molecular orbital level of the P3HT. The disorder parameter σ, which accounts for the broadening of the Gaussian DOS, lies within the range of 49-66 meV. The total density of defects results of order 1016 cm-3.
URI: http://ktisis.cut.ac.cy/handle/10488/7423
ISSN: 00036951
DOI: 10.1063/1.3270105
Rights: © 2009 American Institute of Physics
Type: Article
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