CN2679855Y

CN2679855Y - Thin film laminated solar cell

Info

Publication number: CN2679855Y
Application number: CNU200320119299XU
Authority: CN
Inventors: 姚若河; 郑学仁
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2003-12-17
Filing date: 2003-12-17
Publication date: 2005-02-16
Anticipated expiration: 2013-12-17

Abstract

The utility model discloses a thin film laminated solar cell which orderly comprises a substrate,, electrodes, a p type copper-indium-selenium layer, a n type cadmium sulfide layer, a p type polycrystalline silicon layer, a n type polycrystalline silicon layer and an electrode stacking. The utility model has the characteristics of high absorbing availability and photoelectric conversion efficiency to the solar spectrum, low cost, simple preparation method and good stability.

Description

A kind of pellicular cascade solar cell

Technical field

The utility model relates to a kind of pellicular cascade solar cell.

Background technology

Solar cell can directly be transformed into electric energy with solar energy.Large-scale solar power generation can solve the demand of special occasions such as the particularly energy problem of remote mountain areas and outdoor sports of areas without electricity, field work in the recent period.In the long term,, not only can reach the purpose of environmental protection, and can progressively change traditional energy resource structure if solar cell can large-scale popularization be used, to alleviate energy shortage in the daily life, improving the ecological environment is significant.

Prevailing solar cell is a silica-based solar cell on present technical maturation, the market, and wherein crystal silicon solar energy battery is because its expensive production cost and complicated preparation technology are the major failures of wideling popularize; Though amorphous silicon thin-film solar cell has superiority than the former on cost and technology, because the intrinsic metastable state of material and the characteristic of many defectives cause the stability of battery lower, the large tracts of land photoelectric conversion efficiency is difficult to further raising.

Summary of the invention

The purpose of this utility model is the shortcoming that overcomes silica-based solar cell and amorphous silicon thin-film solar cell, provide that a kind of cost is low, the preparation method is simple, good stability, to the absorption rate and the high pellicular cascade solar cell of photoelectric conversion efficiency of solar spectrum.

Pellicular cascade solar cell of the present utility model is made of substrate, electrode, p type copper indium selenium layer, n type cadmium sulfide layer, p type polysilicon layer, n type polysilicon layer and polar stack successively.

Above-mentioned copper indium selenium layer can be abbreviated as the CIS layer, and cadmium sulfide layer can be abbreviated as the CdS layer.

As improvement of the technical scheme, the aluminium that on cadmium sulfide (CdS) layer, also has one deck nanometer bed thickness, solved cadmium sulfide (CdS) layer so on the one hand and combined problem with the boundary face of polysilicon layer, the while aluminium lamination is again as the metal of inducing of polysilicon metal inducement solid phase crystallization.

Polysilicon membrane is made of many little crystal grain that differ in size, have different high preferred orientations.Many performance parameters of high-quality semiconductor polycrystal silicon thin film are the advantages that integrates crystalline silicon material and hydrogen amorphous silicon alloy film material.It has better photosensitivity, visible luminous energy is effectively absorbed in long-wave band, has the light durability the same with crystalline silicon again, is considered to a kind of desirable solar cell material of efficient, low consumption.On the other hand, the polysilicon membrane of big crystal grain has the high mobility comparable with crystalline silicon.Theoretical Calculation shows that a-Si/Poly-Si stacked solar cell, cascade solar cell efficient can reach 28%.At present, the STAR structure polycrystalline silicon solar cell of Kaneka company design, efficient has reached 10.7%, and do not have amorphous silicon intrinsic photo attenuation phenomenon.And the polycrystalline silicon solar cell of another kind of soi structure has obtained the efficient up to 14.22%.H.Morikawa has made efficient especially up to 16% polycrystalline silicon solar cell sample in the laboratory.

Copper indium diselenide (CIS) is an a kind of I-III-VI family ternary semiconductor material on the other hand, the hetero-junction thin-film solar cell that it and cadmium sulfide (CdS) constitute is the polycrystal film battery that grows up from early 1980s, have cheapness, efficient, the stability and the stronger space radiation resistance that are bordering on single crystal silicon solar cell, from efficient, reached 18.8% to the efficient of battery in 2000.

The utility model is compared with existing solar cell, because it combines the advantage of polycrystal silicon cell and copper indium diselenide battery, therefore has following advantage:

1, raising is to the absorption rate of solar spectrum;

2, adopt laminated construction, improve photoelectric conversion efficiency;

3, employing inexpensive substrate material and thin-film material cheaply, the cost of reduction solar cell, easy to utilize.

Description of drawings

Fig. 1 is the disconnected structural representation of the utility model pellicular cascade solar cell layer.

Embodiment

Pellicular cascade solar cell of the present utility model is made of substrate 1, electrode 201, p type copper indium diselenide (CIS) layer 3, n type cadmium sulfide (CdS) layer 4, p type polysilicon layer 6, n type polysilicon layer 7 and electrode 202 laminations successively.

The preparation method of the utility model pellicular cascade solar cell carries out according to the following step:

(1) adopts magnetron sputtering to add vacuum selenizing method for annealing and on substrate, prepare p type copper indium diselenide (CIS) film;

(2) form copper indium diselenide/cadmium sulfide (CIS/CdS) composite construction with vacuum evaporation method growing n-type cadmium sulfide (CdS) layer on p type copper indium diselenide (CIS) film;

(3) on copper indium diselenide/cadmium sulfide (CIS/CdS) composite construction, adopt PCVD technology and metal inducement solid phase crystallization method to prepare p type polysilicon layer, n type polysilicon layer;

(4) form polysilicon--the thin-film solar cells of copper indium diselenide lamination composite construction.

In order to resolve the problem that combines of cadmium sulfide (CdS) layer and polysilicon layer, between above-mentioned steps (2) and (3), on cadmium sulfide (CdS) layer, plate the aluminium 5 of one deck nanometer bed thickness earlier with the vacuum thermal evaporation method, solved cadmium sulfide (CdS) layer so on the one hand and combined problem with the boundary face of polysilicon layer, the while aluminium lamination is again as the metal of inducing of polysilicon metal inducement solid phase crystallization.

Claims

1. a pellicular cascade solar cell is characterized in that it is made of substrate (1), electrode (201), p type copper indium selenium layer (3), n type cadmium sulfide layer (4), p type polysilicon layer (6), n type polysilicon layer (7) and electrode (202) lamination successively.

2. a kind of pellicular cascade solar cell according to claim 1 is characterized in that plating the aluminium (5) of one deck nanometer bed thickness on cadmium sulfide (CdS) layer.