Abstract
The electrical and optical properties stability of poly(3-hexylthiophene) (P3HT) thin films sensitized with nitromethane ferric chloride (FeCl3) solution was investigated. The optical properties modifications were studied by spectrophotometry and ellipsometry. For electrical characterizations, electrical resistivity measurements were performed. In agreement with the observations of other authors, an important decrease in the electrical resistivity by six orders of magnitude was noticed. In addition, the repeatability and stability of this phenomenon were investigated over a few weeks after sensitization and during different cycles of heating and cooling, both in the dark and under illumination.
Highlights
Organic photovoltaics (OPV) has attracted a particular research interest over the last twenty years, due to important manufacturing advantages of polymer materials, such as high molecular diversity, mechanical flexibility, low-cost of manufacturing, feasibility, easy processability, etc. [1,2,3,4,5,6,7].Polymer–fullerene solar cells are one of the most widely studied solar cells up to today [8,9], achieving an efficiency of almost 10% [10]
The aim of this paper is to investigate the advantages, one of the general main problem of the development of OPV is the poor reproducibility and the stability over time and during cooling and heating cycles, in dark and under stability of films and devices
The aim of this paper is to investigate the reproducibility illumination, of the electrical properties of sensitized polymer films
Summary
Polymer–fullerene solar cells (with a polymer as donor material and fullerene as an acceptor material) are one of the most widely studied solar cells up to today [8,9], achieving an efficiency of almost 10% [10]. New types of acceptor materials were studied in order to replace fullerenes in the active material blend. These new organic solar cells were called “non-fullerene solar cells”, and the highest efficiency obtained, of over 15%, was reported in 2018, by researchers from South China University of Technology (SCUT) [11,12]. The new very promising candidates in the last four years are Poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo [1,2-b:4,5-b’]dithiophene))-alt-(5,5-(10 ,30 -di-2-thienyl-50 ,70 -bis(2-ethylhexyl)benzo[10 ,20 -c:40 ,50 -c’].
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