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Donor–acceptor nanocomposite structures for organic photovoltaic applications
Author(s) -
Fostiropoulos Konstantinos,
Schindler Wolfram
Publication year - 2009
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.200982309
Subject(s) - photocurrent , nanocomposite , materials science , phthalocyanine , acceptor , transmission electron microscopy , substrate (aquarium) , organic solar cell , electron acceptor , phase (matter) , layer (electronics) , analytical chemistry (journal) , chemical engineering , nanotechnology , chemistry , optoelectronics , photochemistry , organic chemistry , composite material , polymer , oceanography , physics , condensed matter physics , geology , engineering
We investigated the effect of substrate temperature T S on the growth of 80 nm donor–acceptor nanocomposite (DAN) layers consisting of co‐evaporated Zn‐phthalocyanine (ZnPc) and C 60 as absorber materials in organic solar cells. High temperature devices show lower series resistances R S but also reduced V OC . Both effects are diminished when the upper 20 nm of the blend are deposited at room temperature (RT). Moreover, the temperature profile improves the photocurrent density J SC . Best efficiencies (up to 2.1%) were achieved applying a 90 °C/RT profile. Transmission electron microscopy studies on the corresponding DAN revealed the temperature‐dependent formation of crystalline C 60 phases (already at low T S ) and crystalline ZnPc phases (at highest T S ). The strong phase separation at 90 °C results in less compact and mechanical unstable films. Such devices exhibit low parallel resistance R P . When the cold cover layer is applied R P doubles.