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Preparation of Novel Semicondutor Nano-crystals and Their Application for Sola Cell

Author: ChenYingJuan
Tutor: HuangJingYun；JinYiZheng
School: Zhejiang University
Course: Materials Science and Engineering
Keywords: Solar cells Photovoltaic effect Nanocrystalline Heterojunction Spin coating
CLC: TM914.4
Type: Master's thesis
Year: 2011
Downloads: 173
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Abstract


This paper focuses on the preparation of new nanomaterials and explore in heterojunction solar cells, the synthesis of several semiconductor nanomaterials, nanomaterials prepared for the assembly of the photovoltaic device structure design, performance testing and trial production of solar devices . Specific work includes the following aspects: 1. Preparation of a series of semiconductor nanocrystals. The simple method of this paper were synthesized in a liquid phase dispersion of good, uniform size of the CdSe, ZnO, of FeS2 nano-crystals, and the use of means such as UV, PL, XRD, TEM characterization. 3.7-4.3 nm diameter CdSe nanocrystals synthesized by hot injection method, with a band gap of about 2.15 eV; solution method synthesized ZnO nanocrystals about 5 nm in diameter, the band gap of about 3.72 eV. Especially worth mentioning is that the quantum dot synthesis path learn of Ⅱ - Ⅵ this article, for the first time with a hot injection synthesis of FeS2 nanocrystals of 7.5-9.5 nm in diameter, the band gap of about 1.1-1.2 eV. In addition, this paper also simple reaction time on the reaction products. 2 was prepared according to the above three-nanometer valence band energy level of the conduction band of the material matching relationship, a heterojunction solar cell. One for the ITO / PEDOT: PSS / CdSe / ZnO / Al (battery A), the second ITO / PE-DOT: PSS/P3HT/FeS2/Al (battery B). The films are a few tens of nanometers thick, the total thickness of the device is about a few hundred nanometers. 3 experimental scheme used to achieve the above-mentioned design comprising: ITO glass substrate, a film was prepared by spin-coating process, the deposited electrode under vacuum conditions, and ultimately in the glove box packaged into a complete photovoltaic device. Using an appropriate processing steps during the preparation of the device in order to obtain a higher device efficiency: In order to reduce the distance between the nanoparticles and improve the conductivity of the carrier, prepared CdSe nanocrystals and FeS2 Nanocrystalline ligand exchange with good conductivity The pyridine was replaced the surface of the original long-chain organic ligand; random to reduce carrier conduction in the process of composite keys with bidentate dimercaptobenzene CdSe nanocrystals be crosslinked, so neatly dense. 4. Prototype device placed in a standard test conditions tested, Battery A, open circuit voltage of 0.46 V; short-circuit current of 1.01 mA/cm2; fill factor of 0.29; energy conversion efficiency of about 0.13%. Battery B, the open circuit voltage of 0.38 V; short circuit current of 1.69 mA/cm2; fill factor of 0.35; energy conversion efficiency of about 0.23%.

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