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Successive Spray Deposition of P3HT/PCBM Organic Photoactive Layers: Material Composition and Device Characteristics
Author(s) -
Abdellah Alaa,
Virdi Kulpreet Singh,
Meier Robert,
Döblinger Markus,
MüllerBuschbaum Peter,
Scheu Christina,
Lugli Paolo,
Scarpa Giuseppe
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201200548
Subject(s) - materials science , active layer , organic solar cell , photoactive layer , fabrication , heterojunction , polymer solar cell , acceptor , optoelectronics , chemical engineering , layer (electronics) , nanotechnology , solar cell , composite material , polymer , medicine , thin film transistor , alternative medicine , physics , pathology , condensed matter physics , engineering
Controlling the active layer composition in organic electronic devices represents one of the major challenges in their fabrication. In particular, the composition of mixed donor/acceptor active layers for photosensitive device applications is known to strongly influence device performance. Here, an alternative approach for the preparation of organic heterojunction photoactive layers by successive spray deposition of the donor material, poly(3‐hexylthiophene) (P3HT), and acceptor material, [6,6]‐phenyl C61‐butyric acid methyl ester (PCBM), is reported. Optical absorption spectra, X‐ray reflectivity, and cross‐sectional transmission electron microscopy investigations are used to indicate the penetration of PCBM into a previously deposited P3HT layer and the spontaneous formation of a bulk heterojunction (BHJ) within the active layer, which provides the large interfacial area needed for efficient exciton dissociation. It is shown that organic photodiodes composed of photoactive layers prepared using this fabrication method exhibit a performance comparable to conventional BHJ devices in which the active layer is rigorously blended in advance. Moreover, separate handling of the individual materials and their deposition from distinct solutions enables an enhanced control of the active layer composition and hence increases the ability of tuning device characteristics.