Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Halbleiterphysik
HL 57: Poster IIa
HL 57.7: Poster
Dienstag, 8. März 2005, 16:30–19:00, Poster TU E
Determination of hole mobility and lifetime in bulk heterojunction solar cells by photoinduced absorption spectroscopy — •Stefan Voigt1, Uladzimir Zhokhavets1, Gerhard Gobsch1, Maher Al-Ibrahim2,3, Oliver Ambacher2 und Steffi Sensfuss3 — 1Institute of Physics, Ilmenau Technical University, 98684 Ilmenau, Germany — 2Centre of Micro- and Nanotechnologies, Ilmenau Technical University, 98684 Ilmenau, Germany — 3TITK Inst. Rudolstadt, Dept. Functional Polymer Systems, 07407 Rudolstadt, Germany
Increasing the power conversion efficiency of bulk heterojunction polymer/fullerene solar cells is the aim of numerous research groups for several years. In particular, the efficiency is limited due to low charge carrier mobilities µ and lifetimes τ. In order to improve the efficiency, the product µτ needs to be increased. In our work, the hole mobility and lifetime in poly(3-hexylthiophene) (P3HT) / [6,6]phenyl-C61-butric acid methyl ester (PCBM) solar cells were determined by photoinduced absorption (PIA) spectroscopy. The hole lifetime was determined from the frequency dependence of the PIA - signal. The out-of-plane hole mobility was deduced from the dependence of the hole lifetime on the applied voltage. The influence of annealing temperature on these parameters was investigated.