By Topic

Enhanced performance of poly-3(hexylthiophene) - single walled carbon nanotube bulk heterojunction solar cells using a poly-3(hexylthiophene) buffer layer and Ca electrode

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Arun Tej Mallajosyula ; Department of Electrical Engineering and Samtel Centre for Display Technologies, Indian Institute of Technology Kanpur, India ; S. Sundar Kumar Iyer ; Baquer Mazhari

An enhancement in the performance of P3HT:SWNT bulk heterojunction solar cell was achieved by using a buffer layer of P3HT between the anode and the bulk layer. The buffer layer improved the shunt resistance of the device (1 wt% SWNT) from 25 k¿ to 400 k¿. This resulted in the increase of open circuit voltage from 0.06 V to 0.45 V. Because of the increased thickness, the light absorbed by the device increased resulting in the short circuit current density, Jsc, to improve from 2.54 ¿A cm-2 to 13.25 ¿A cm-2. Variation of SWNT content in P3HT showed that the optimum concentration of SWNTs is near 0.25 wt% which gave the highest open circuit voltage, Voc, of 0.53 V. Dark characteristics of these devices show a ohmic behavior at low voltages indicating that addition of SWNTs resulted in increased residual charges. Reverse photocurrent of the devices is found to increase considerably with higher concentration of SWNTs. Spectral response of the devices show that SWNTs do not contribute to generation of photocurrent. Thus, we conclude that SWNTs help only in charge transport in P3HT devices. Use of Ca cathode increased Jsc to 16.4 ¿A cm-2 and Voc to 0.65 V because of the higher built-in field.

Published in:

Photovoltaic Specialists Conference (PVSC), 2009 34th IEEE

Date of Conference:

7-12 June 2009