| Grant number: | 09/15848-0 |
| Support Opportunities: | Scholarships abroad - Research |
| Effective date (Start): | February 01, 2010 |
| Effective date (End): | March 19, 2010 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Condensed Matter Physics |
| Principal Investigator: | Lucas Fugikawa Santos |
| Grantee: | Lucas Fugikawa Santos |
| Host Investigator: | Heinz von Seggern |
| Host Institution: | Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil |
| Research place: | Technische Universität Darmstadt (TU Darmstadt), Germany |
Abstract In this project, the electrical properties of pentacene-based optoelectronic devices will be studied in metal/pentacene/metal structures using different metals as electrodes, different thickness of the active layer and at different temperatures. The aim of the project is to understand the charge-carrier injection and transport processes in organic semiconductors by means of current-voltage (I-V) and impedance/capacitance spectroscopy techniques. Particularly, the negative capacitance (NC) effect, which occurs at certain experimental conditions in the low-frequency region, will be investigated. The results will be analyzed qualitatively using theories which consider space-charge effects and charge-carrier recombination in the bulk. The elaboration of a quantitative model for the negative capacitance effect in organic semiconductors, based on the analysis of the preliminary data, is also intended. (AU) | |
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