Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 50: Poster II
HL 50.50: Poster
Donnerstag, 30. März 2006, 16:30–19:00, P3
Optical investigation of P3HT/PCBM bulk heterojunction solar cells by photoinduced absorption spectroscopy — •Stefan Voigt1, Uladzimir Zhokhavets1, Harald Hoppe1, Gerhard Gobsch1, Maher Al-Ibrahim2, Oliver Ambacher2, and Steffi Sensfuss3 — 1Institute of Physics, Ilmenau Technical University, 98684 Ilmenau, Germany — 2Centre for Micro- and Nanotechnologies, Ilmenau Technical University, 98684 Ilmenau, Germany — 3TITK Inst. Rudolstadt, Dept. Functional Polymer Systems, 07407 Rudolstadt, Germany
An important parameter that determines the efficiency of organic solar cells is the product of the mobility and lifetime of generated charge carriers. This product needs to be increased by an optimized choise of the materials and balanced production processes. In this work, this mobility - lifetime product of positive polarons is determined in dependence on temperature and excitation density by dynamic photoinduced absorption experiments on the accomplished devices. In addition the recombination characteristics were regarded by studying the excitation density dependence of the signal. The influence of annealing on the recombination properties is investigated, too.