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Dynamical optical investigation of polymer/fullerene composite solar cells
Author(s) -
Voigt S.,
Zhokhavets U.,
AlIbrahim Maher,
Hoppe H.,
Ambacher O.,
Gobsch G.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200743382
Subject(s) - polaron , fullerene , organic solar cell , materials science , spectroscopy , polymer solar cell , heterojunction , polymer , optoelectronics , charge carrier , composite number , absorption (acoustics) , analytical chemistry (journal) , chemical physics , molecular physics , solar cell , chemistry , physics , composite material , organic chemistry , quantum mechanics , electron
We investigate organic polymer/fullerene (P3HT/PCBM) bulk heterojunction solar cells by means of photoinduced absorption spectroscopy (PIA). The dynamic properties of the charge carriers are studied in the temperature range of 5 K to 200 K by recording the PIA signal in the frequency domain. The mobility and the lifetime of the positive polarons are de‐ termined. The dependence of the short circuit current on the incident light intensity is also investigated. Finally, the properties of annealed and not annealed solar cells are compared. As the most interesting result, the appearance of two polaron species on different time scales is observed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)