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Stability and degradation mechanisms in organic solar cells

Abstract

This thesis deals with stability improvements and the investigation of degradation mechanisms in organic solar cells. Organic solar cells have been in the focus of extensive academic research for over almost two decades and are currently entering the market in small scale applications. For successful large scale applications, next to the improvement of the power conversion efficiency, the stability of organic solar cells has to be increased. This thesis is dedicated to the investigation of novel materials and architectures to study stability-related issues and degradation mechanisms in order to contribute to the basic understanding of the working principles of organic solar cells. Here, impedance spectroscopy, a frequency domain technique, is used to gain information about stability and degradation mechanisms in organic solar cells. In combination with systematic variations in the preparation of solar cells, impedance spectroscopy gives the possibility to differentiate between interface and bulk dominated effects. Additionally, impedance spectroscopy gives access to the dielectric properties of the device, such as capacitance. This offers among other things the opportunity to probe the charge carrier concentration and the density of states. Another powerful way of evaluation is the combination of experimentally obtained impedance spectra with equivalent circuit modelling. The thesis presents  More>>
Authors:
Publication Date:
Apr 26, 2012
Product Type:
Thesis/Dissertation
Report Number:
ETDE-DE-2914
Resource Relation:
Other Information: TH: Diss. (Dr.rer.nat.)
Subject:
14 SOLAR ENERGY; STABILITY; EFFICIENCY; IMPEDANCE; SPECTROSCOPY; INTERFACES; DIELECTRIC PROPERTIES; CAPACITANCE; CHARGE CARRIERS; EQUIVALENT CIRCUITS; ORGANIC SOLAR CELLS; DECOMPOSITION; FULLERENES; TITANIUM OXIDES; POLYMERS
OSTI ID:
22176209
Research Organizations:
Oldenburg Univ. (Germany). Fakultaet 5 - Mathematik und Naturwissenschaften
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
TRN: DE13G9503
Availability:
Commercial reproduction prohibited. Available from ETDE as OSTI ID: 22176209;
Submitting Site:
DE
Size:
88 page(s)
Announcement Date:
Dec 19, 2013

Citation Formats

Ecker, Bernhard. Stability and degradation mechanisms in organic solar cells. Germany: N. p., 2012. Web.
Ecker, Bernhard. Stability and degradation mechanisms in organic solar cells. Germany.
Ecker, Bernhard. 2012. "Stability and degradation mechanisms in organic solar cells." Germany.
@misc{etde_22176209,
title = {Stability and degradation mechanisms in organic solar cells}
author = {Ecker, Bernhard}
abstractNote = {This thesis deals with stability improvements and the investigation of degradation mechanisms in organic solar cells. Organic solar cells have been in the focus of extensive academic research for over almost two decades and are currently entering the market in small scale applications. For successful large scale applications, next to the improvement of the power conversion efficiency, the stability of organic solar cells has to be increased. This thesis is dedicated to the investigation of novel materials and architectures to study stability-related issues and degradation mechanisms in order to contribute to the basic understanding of the working principles of organic solar cells. Here, impedance spectroscopy, a frequency domain technique, is used to gain information about stability and degradation mechanisms in organic solar cells. In combination with systematic variations in the preparation of solar cells, impedance spectroscopy gives the possibility to differentiate between interface and bulk dominated effects. Additionally, impedance spectroscopy gives access to the dielectric properties of the device, such as capacitance. This offers among other things the opportunity to probe the charge carrier concentration and the density of states. Another powerful way of evaluation is the combination of experimentally obtained impedance spectra with equivalent circuit modelling. The thesis presents results on novel materials and solar cell architectures for efficient hole and electron extraction. This indicates the importance of knowledge over interlayers and interfaces for improving both the efficiency and stability of organic solar cells.}
place = {Germany}
year = {2012}
month = {Apr}
}