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Study of Molybdenum Back Contact for CIGS Solar Cells——research on Sodium Dopped Molybdenum Films and Molybdenum Films Deposited on Ceramic Substrates

Author: ZhangRan
Tutor: ZhangFengYan
School: Xiamen University
Course: Photovoltaic Engineering
Keywords: Molybdenum back contact Sodium doped molybdenum film Molybdenum paste
CLC: TM914.4
Type: Master's thesis
Year: 2014
Downloads: 2
Quote: 0
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Abstract


Recently, CIGS thin film solar cell was considered to have big potential and prospective future. In this article, in order to improve the efficiency of CIGS solar cells and decrease the manufacturing cost of CIGS solar cell, two areas of research were conducted for the molybdenum electrodes of CIGS solar cell. One area is, through magnetron sputtering MoNa target, sodium was introduced into CIGS absorbing layer to improve the efficiency of the cell, we have explored the influence of sodium upon CIGS absorbing layer and efficiency of CIGS solar cell. The second area is, through the utilization of molybdenum paste, molybdenum films were deposited on ceramic substrates. Molybdenum films were annealed at high temperature, and the influence of high temperature annealing upon molybdenum films properties were investigated.MoNa target and Mo target were used for the DC sputtering of MoNa films, the best structure of MoNa films is a kind of laminated construction of Mo/MoNa/Mo, the amount of sodium dopped into film was controlled through the change of the thickness of MoNa films. CIGS prefabricate layers were deposited on MoNa layers, the layers formed CIGS absorbing layers after selenizing. CIGS solar cells were prepared by thermal evaporation post-selenizing on MoNa layers. Through representation of CIGS absorbing layers and CIGS solar cells, the conclusion was drawn, in experiment conditions of this article, the best sutructure of MoNa layer is from the bottom up respectively:800nm Mo film/80nm MoNa film/100nm Mo film.High temperature resistant ceramic substrates were chosen for the deposition of molybdenum paste, and the molybdenum films were deposited with scraper and silk-screen printing. The molybdenum films were annealed at high temperature (800～1200℃) after stage drying. The microstructure of the films was observed through SEM, meanwhile, electrical conductibility test and adhesion test were commissioned. By analyzing the result of tests, the samples annealed temperature of 1000℃was considered as the best ones which show excellent adhesion and electrical conductibility. Another reason to choose ceramic substrates was that ceramics were considered as regular building materials, the deposition of molybdenum films on ceramic substrates might help the researches of BIPV.

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