Improved charge separation and transport efficiency in poly(3-hexylthiophene)-TiO2 nanorod bulk heterojunction solar cells

In this article, we have fabricated photovoltaic devices based on the poly(3-hexylthiophene)-TiO2 nanorod bulk heterojunction. The microscopic mechanisms of charge separation and charge transport in the poly(3-hexylthiophene)-TiO2 nanorod nanocomposites have been investigated by photoluminescence qu...

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Bibliographic Details
Published in:Journal of materials chemistry 2008-01, Vol.18 (19), p.2201-2207
Main Authors: CHANG, Chia-Hao, HUANG, Tse-Kai, LIN, Yu-Ting, LIN, Yun-Yue, CHEN, Chun-Wei, CHU, Tsung-Hung, SU, Wei-Fang
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Energy
Exact sciences and technology
Forms of application and semi-finished materials
Materials science
Miscellaneous
Nanoscale materials and structures: fabrication and characterization
Natural energy
Photovoltaic conversion
Physics
Polymer industry, paints, wood
Quantum wires
Solar cells. Photoelectrochemical cells
Solar energy
Technology of polymers
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Summary:In this article, we have fabricated photovoltaic devices based on the poly(3-hexylthiophene)-TiO2 nanorod bulk heterojunction. The microscopic mechanisms of charge separation and charge transport in the poly(3-hexylthiophene)-TiO2 nanorod nanocomposites have been investigated by photoluminescence quenching, time-resolved photoluminescence spectroscopy, and time-of-flight mobility measurements. Charge separation and transport efficiency can be improved by adding an adequate amount of TiO2 nanorods in polymer. In addition, the device performance can be further enhanced by thermal annealing or removal of insulating surfactant in the hybrid, giving an optimized device performance of a short circuit current density of 2.62 mA cm-2, an open circuit voltage of 0.69 V, a fill factor of 0.63 under simulated A.M. 1.5 illumination (100 mW cm-2). The corresponding power conversion efficiency under 1 sun is about 1.14%.
ISSN:0959-9428
1364-5501
DOI:10.1039/b800071a