Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 62: Poster II: Photovoltaics and Organic Semiconductors
HL 62.8: Poster
Donnerstag, 25. März 2010, 18:00–20:00, Poster D2
Influence And Optimization Of The Exciton Blocking Layer In Diindenoperylene Based Photovoltaic Cells — •E. Runze1, A.K. Topczak1, M. Meseth1, T. Roller2, and J. Pflaum1,3 — 1Inst. Exp. Phys. VI, Julius-Maximilians-University, 97074 Würzburg — 23rd Phys. Inst., Stuttgart University, 70550 Stuttgart — 3ZAE Bayern, 97074 Würzburg
The power conversion efficiency of small molecule Organic Photovoltaic Cells (OPVCs) strongly depends on the exciton diffusion length as well as on the respective energy level positions at the donor acceptor and the metal-organic interface. We discuss two major aspects determining the OPVC performance: the exciton blocking and the exciton diffusion. As bilayer systems, OPVCs based on Diindenoperylen (DIP) as donor and C60 as acceptor material were employed. We analyse the influence of various exciton blocking layers (EBL) like Batho-Phenanthrolin (BPhen) or 1,4,5,8-Naphthalene-Tetracarboxylic Acid Dianhydride (NTCDA). Beside the position of the electronic levels the nucleation behavior of the metal contact on the EBL is a critical factor. The second part addresses the comparatively large exciton diffusion lengths in DIP of about 100nm [1]. We performed complementary studies on OPVC photocurrent as well as on photoluminescence (PL)-quenching on layered stacks of similar composition. A strong correlation between the exciton transport characteristics and the crystalline morphology of the DIP layer is demonstrated. Financial support by DFG (project PF385/4) is gratefully acknowledged.
[1] D. Kurrle and J. Pflaum, Appl. Phys. Lett. 92 (2008) 133306