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

被引：17
作者：
Abeygunasekara, Waranatha L. [1 ,2 ]
Hiralal, Pritesh [2 ]
Samaranayake, Lilantha [1 ]
Chien, Chih-Tao [2 ]
Kumar, Abhishek [2 ]
Flewitt, Andrew J. [2 ]
Karunaratne, Veranja [3 ]
Amaratunga, Gehan A. J. [2 ]
机构：
[1] Univ Peradeniya, Fac Engn, Dept Elect & Elect Engn, Peradeniya 20400, Sri Lanka
[2] Univ Cambridge, Dept Engn, Elect Engn Div, Cambridge CB3 0FA, England
[3] Univ Peradeniya, Dept Chem, Fac Sci, Peradeniya 20400, Sri Lanka
来源：
APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 12期
关键词：
OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC DEVICES; ENHANCEMENT; RECOMBINATION; MORPHOLOGY; ADDITIVES; TRANSPORT; BLENDS;
D O I：
10.1063/1.4916512
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on the improvement of power conversion efficiency (PCE) of PTB7/PC70BM 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. (C) 2015 AIP Publishing LLC.
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页数：5
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