Measurement of contact voltage drop and resistance in organic solar cells

Williams, E. L., Ooi, Z., Sonar, Prashant, & Dodabalapur, A. (2012) Measurement of contact voltage drop and resistance in organic solar cells. Applied Physics Letters, 101(25), p. 253902.

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Bulk heterojunction organic solar cells based on poly[4,7-bis(3- dodecylthiophene-2-yl) benzothiadiazole-co-benzothiadiazole] and [6,6]-phenyl C71-butyric acid methyl ester are investigated. A prominent kink is observed in the fourth quadrant of the current density-voltage (J-V) response. Annealing the active layer prior to cathode deposition eliminates the kink. The kink is attributed to an extraction barrier. The J-V response in these devices is well described by a power law. This behavior is attributed to an imbalance in charge carrier mobility. An expected photocurrent for the device displaying a kink in the J-V response is determined by fitting to a power law. The difference between the expected and measured photocurrent allows for the determination of a voltage drop within the device. Under simulated 1 sun irradiance, the peak voltage drop and contact resistance at short circuit are 0.14 V and 90 Ω, respectively. © 2012 American Institute of Physics.

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ID Code: 75268
Item Type: Journal Article
Refereed: Yes
Keywords: Active Layer, Bulk heterojunction organic solar cells, Cathode deposition, Contact voltage drops, Methyl esters, Organic solar cell, Peak voltage, Voltage drop, Heterojunctions, Solar cells
DOI: 10.1063/1.4772203
ISSN: 00036951
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 American Institute of Physics
Deposited On: 21 Aug 2014 00:44
Last Modified: 25 Aug 2014 01:47

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