PHOTO-CARRIER DYNAMICS OF BLENDED AND MULTI-LAYERED FILMS OF ZINC PHTHALOCYANINE AND C-60 MEASURED BY TIME-RESOLVED TERAHERTZ SPECTROSCOPY


Melinger J. S. , Lane P., Esenturk O. , Heilweil E.

35th IEEE Photovoltaic Specialists Conference, Hawaii, Amerika Birleşik Devletleri, 20 - 25 Haziran 2010, ss.1616-1620 identifier identifier

  • Doi Numarası: 10.1109/pvsc.2010.5616508
  • Basıldığı Şehir: Hawaii
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.1616-1620

Özet

We present a study of photo-induced carrier dynamics in organic thin films that contain zinc phthalocyanine (ZnPc) and buckminsterfullerene (C-60) investigated by ultrafast time resolved terahertz spectroscopy (TRTS). We compare two classes of films: 1) blend films of ZnPc and C-60 prepared by co-evaporation, and 2) superlattice films from alternating neat layers of ZnPc and C-60, where the individual layer varies in thickness between 2 nm and 40 nm. These films are model structures for the charge generation layers in organic photovoltaics, and their photo-carrier dynamics on a femtosecond to nanosecond timescale is of high interest. Using TRTS, which employs an optical pump pulse and a time delayed terahertz (THz) probe pulse, we find evidence for a short-lived charge transfer state of C-60 that decays within several picoseconds of excitation. Both blend and superlattice films have a long-lived (> 80 picoseconds) THz absorption that is dependent on the structure and composition of the films. The optimum composition for maximum photocarrier generation efficiency is a 1:1 blend of ZnPc and C-60. Amongst the layered films, we find that the photocarrier efficiency increases as the individual layer thickness decreases, with the film having ultrathin alternating 2 nm thick layers exhibiting the strongest THz absorption. A much stronger THz absorption signal was obtained for the 2 nm layered film than for the best blend film.