Highly Photoactive Titanyl Phthalocyanine Polymorphs as Textured Donor Layers in Organic Solar Cells
| Autor: | Diogenes Placencia, Weining Wang, Jeremy Gantz, Judith L. Jenkins, Neal R. Armstrong |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Photocurrent
chemistry.chemical_classification Materials science Organic solar cell business.industry Heterojunction Molar absorptivity Electron acceptor Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Absorbance chemistry.chemical_compound General Energy chemistry Phthalocyanine Optoelectronics Physical and Theoretical Chemistry Thin film business |
| Zdroj: | The Journal of Physical Chemistry C. 115:18873-18884 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp2052085 |
| Popis: | We present a comparison of the photovoltaic activity of organic solar cells (OPVs) based on vacuum-deposited and solvent-annealed titanyl phthalocyanine (TiOPc) donor layers with C60 as the electron acceptor, where the TiOPc donor layer exists in three different polymorphic forms: TiOPc included the “as-deposited” form, with a Q-band absorbance spectrum reminiscent of the phase I polymorph, and films subjected to solvent annealing which systematically increased the fraction of either the phase II (α-phase) or the phase III (γ-TiOPc) polymorphs. As-deposited TiOPc/C60 heterojunctions showed open-circuit photopotentials (VOC) of ca. 0.65 V, with estimated AM 1.5G efficiencies of ca. 1.4%. Partial conversion of these thin films to their phase II or phase III polymorphs significantly enhanced the short-circuit photocurrent (JSC), as a result of (i) texturing of the TiOPc layers (ca. 100 nm length scales) and (ii) enhancements in near-IR absorptivity/photoelectrical activity. All TiOPc/C60 heterojunctions, cha... |
| Databáze: | OpenAIRE |
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