Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 94, Issue 2, Pages 310-316Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2009.10.004
Keywords
Organic heterojunction solar cell; Molecular polarizability; Single crystal structure; Coulomb interaction
Funding
- Bundesministerium fur Bildung und Forschung (BMBF) [F13N9714]
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The influence of the molecular polarizability alpha of different donor molecules on the open circuit voltage V-oc of organic hetero-junction solar cells (HJCs) was theoretically and experimentally investigated. Therefore, novel zinc phthalocyanine (ZnPc) derivatives were synthesized having phenyl, naphthyl or anthracenyl groups attached to basic ZnPc cores, By adding bulky groups. the molecular polarizability Was Successively increased. Since the influence of alpha on the Coulomb interaction of charges will depend on the molecular arrangement of the respective molecules, the respective single crystal structures were solved by high resolution XRD. Based on the solved structures, quantum mechanical calculations of the charge separation mechanism were performed on model systems. The implications of the observed electronic effects will be discussed and related to the device performance. (C) 2009 Elsevier B.V. All rights reserved.
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