CUED Publications database

Incorporating semiconducting single-walled carbon nanotubes as efficient charge extractors in organic solar cells

Abeygunasekara, WL and Hiralal, P and Samaranayake, L and Chien, CT and Kumar, A and Flewitt, AJ and Karunaratne, V and Amaratunga, GAJ (2015) Incorporating semiconducting single-walled carbon nanotubes as efficient charge extractors in organic solar cells. Applied Physics Letters, 106. ISSN 0003-6951

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Abstract

© 2015 AIP Publishing LLC. We report on the improvement of power conversion efficiency (PCE) of PTB7/PC 70 BM solar cells by the addition of small quantities (0.02%-0.04%) of pristine single-walled carbon nanotubes (SWNTs) in the active-layer. SWNTs and purified semiconducting SWNTs (S-SWNTs) were added in quantities, which is 2 orders of magnitude lower than previously reported value and resulted in a reduction in the series resistance of the solar cell with minor changes on the shunt resistance. On addition of purified S-SWNT, the PCE of air measured devices enhanced by 29% from 4.9% to 6.3%, with short-circuit current density (J sc ) improving from 12.1?mA/cm 2 to 14.4?mA/cm 2 and a fill factor improvement from 54% to 61%. In addition, the role of processing additive N-Methyl-2-pyrrolidone, which acts as a SWNT dispersant, is also investigated. A single diode model of a solar cell is used to extract the cell parameters and understand the effect of SWNTs. Based on experimental data and it's fitting to the single diode model, we propose that S-SWNT improve the transport and extraction of photogenerated charges within the solar cell device.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:34
Last Modified: 23 Nov 2017 03:59
DOI: