Modeling, synthesis, and testing of materials and devices for organic semiconductor solar cells

Paul Panayotatos; Jonathan B. Whitlock; George R. Bird

doi:10.1117/12.130579

9 December 1992 Modeling, synthesis, and testing of materials and devices for organic semiconductor solar cells

Paul Panayotatos, Jonathan B. Whitlock, George R. Bird

Proceedings Volume 1729, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Photovoltaics, Photochemistry, Photoelectrochemistry; (1992) https://doi.org/10.1117/12.130579
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France

Abstract

In our work with the phthalocyanines and perylenes, we have formulated a hierarchy of placement of dyes in p-n heterojunction devices to optimize the short circuit current density. Computer modeling of Schottky barrier cells, with parameters fit to experimental results and incorporating field-dependent carrier generation, were used to optimize the power efficiency. The model predicts an optimum carrier concentration density and suggests different hierarchies for utilization of Foerster radiationless energy transfer. Synthesis and purification of materials is also discussed. In terms of purity, most materials used in the literature are shown to have been quite below solar grade. A newly devised purification technique is introduced. A hydration mechanism is shown to exist for chloroaluminum phthalocyanine, previously thought immune to hydration. The latter mechanism had been mistaken before for a simple phase transformation and can be induced by various different treatments with organic solvents in which chloroaluminum phthalocyanine is not soluble. Testing of p-n and Schottky barrier cells is also discussed. The different capacitance vs. voltage (C-V) spectroscopies are compared, and the case for the small signal method is argued over the triangular voltage sweep. Several cautions on the interpretation of the C-V curves are noted.

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Paul Panayotatos, Jonathan B. Whitlock, and George R. Bird "Modeling, synthesis, and testing of materials and devices for organic semiconductor solar cells", Proc. SPIE 1729, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Photovoltaics, Photochemistry, Photoelectrochemistry, (9 December 1992); https://doi.org/10.1117/12.130579

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KEYWORDS

Excitons

Absorption

Quantum efficiency

Solar cells

Silicon

Heterojunctions

Diffusion

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