Series resistance in organic bulk-heterojunction solar devices: Modulating carrier transport with fullerene electron traps
Autor: | Germà Garcia-Belmonte, Pablo P. Boix, Teresa Ripolles-Sanchis, Antonio Guerrero |
---|---|
Rok vydání: | 2012 |
Předmět: |
Photovoltaic devices
Materials science Fullerene Analytical chemistry Transport 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Polymer solar cell law.invention Current–voltage characteristics Biomaterials Series resistance law Solar cell Materials Chemistry Electrical and Electronic Engineering Equivalent series resistance General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Acceptor Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials Dielectric spectroscopy Active layer Chemical physics Trapping 0210 nano-technology |
Zdroj: | Repositori Universitat Jaume I Universitat Jaume I |
DOI: | 10.1016/j.orgel.2012.06.043 |
Popis: | Series resistance is one of the key parameters affecting the performance of organic photovoltaic devices. Several electronic mechanisms arising from different structures within the solar cell can contribute to increasing it. We focus on the series resistance origin by altering the acceptor transport properties trough the incorporation of fullerene traps located at energies below the transporting electron levels. Indene-C 60 bisadduct as acceptor molecule blended with poly(3-hexylthiophene) forms the active layer in which small amounts of [6,6]-phenyl-C 61 -butyric acid methyl ester have been added as trapping sites. A complete analysis of the impedance response has allowed identifying bulk transport resistive circuit elements in the high-frequency part of the spectra. Series resistance is observed to be dependent on the concentration of fullerene traps, thus indicating a connection between bulk transport processes and resistive elements. By comparing different contacts it has been discarded that outer cathode interfaces influence the series resistance experimentally extracted from impedance spectroscopy. |
Databáze: | OpenAIRE |
Externí odkaz: |