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Preparation and Photovoltaic Properties of Cr-TiO2/P3HT Heterojunction Solar Cells

Author: WangXiangQian
Tutor: WangChengWei
School: Northwest Normal University
Course: Condensed Matter Physics
Keywords: polymer heterojunction solar cells Cr3+ doped TiO2nanofilm photovoltaic properties
CLC: TM914.4
Type: Master's thesis
Year: 2013
Downloads: 4
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Abstract


Inorganic semiconductor-Organic polymer heterojunction solar cells haveattracted a great interest as an alternative type of polymer solar cells due to theircomprehensive advantages of large area, low cost, and flexible of polymersemiconductors and high electron mobility of inorganic semiconductors. As theinorganic material, titanium dioxide （TiO2） has a serious issue that is how to decreasethe band gap of TiO2and enhance its photoresponse for visible light. The thesis hasgiven an overview of the current progress, and suffered problems about theoptimization of inorganic-organic polymer solar cells by doping, modification and soon. Aimed at the amount of Cr3+doping and the optimization of structures of lightactive layer, we tried to improve the photovoltaic properties of Cr-TiO2/P3HTheterojunction solar cells. The corresponding works and results were shown asfollowing:1. Cr doped TiO2（Cr-TiO2） nanofilms were prepared by sol-gel. The as-preparedsamples were characterized in detail by scanning electron microscopy, X-raydiffraction, X-ray photoelectron spectroscopy, UV-VIS transmittance spectroscopy. Itcan be seen that the amount of doping deeply influence crystal structure andabsorption edge of TiO2films. Then, a bilayer solar cells consisting of P3HT andCr-TiO2nanocrystal films have been fabricated. The results indicated that Cr3+dopingis not only can increase the JSCand FF, the samples’ open-circuit voltage was alsoremarkably enhanced from0.42V to0.99V with the increase of Cr3+dopingconcentration, and the device power conversion efficiency of0.65%is improved morethan9times compared with that of the cell based on pure TiO2. The reason is mainlyattributed to the broadened the absorption region and the up-shift of conduction bandedge of TiO2film with the Cr3+doping.2. Cr-TiO2films with porous nanostructure were fabricated by simple sol-gelmethod using a prepared Cr-TiO2with the addition of polyethylene glycol2000（PEG2000） and were used to assemble Cr-TiO2/P3HT heterojunction photovoltaicdevices. The photovoltaic properties of Cr-TiO2/P3HT heterojunction and the correlations between the photovoltaic properties of Cr-TiO2/P3HT and the structureparameters of porous Cr-TiO2were studied in details. The results shown that not onlythe porous structure and the spectral transmittance of the Cr-TiO2films could becontrolled by the amount of PEG2000, but also the short-circuit current density andthe power conversion efficiency enhanced from2.03to3.09mA cm-2and0.68%to0.86%, respectively.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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