The effect on CdS/CdTe solar cell conversion efficiency of the presence of fluorine in the usual CdCl2 treatment of CdTe

被引：19
作者：
Echendu, O. K. [1 ,2 ]
Dharmadasa, I. M. [1 ]
机构：
[1] Sheffield Hallam Univ, Mat & Engn Res Inst, Elect Mat & Sensors Grp, Sheffield S1 1WB, S Yorkshire, England
[2] Fed Univ Technol Owerri, Dept Phys, Solar Energy & Mat Sci Grp, Owerri, Nigeria
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2015年 / 157卷
关键词：
Chalcogenide; Electronic material; Semiconductor; Thin film; Heat treatment; Electrochemical technique; ELECTRICAL CONTACTS; DIFFUSION; LAYERS; CDS; INTERFACES; GROWTH; MELT;
D O I：
10.1016/j.matchemphys.2015.03.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The addition of CdF2 to the CdCl2 solution used in the well-known CdCl2 treatment of CdS/CdTe solar cells has been observed to drastically improve the conversion efficiency of fully fabricated CdS/CdTe solar cells. The observed improvement is as a result of further enhancement of structural and optoelectronic properties of the CdCl2 + CdF2-treated CdTe layers compared to the CdCl2-treated CdTe layers. A set of CdS/CdTe samples were grown by electrochemical deposition under different conditions and each sample was divided into two. One set of these parts was treated with only CdCl2 solution while the other set was treated with the CdCl2 + CdF2 mixture. Both sets were annealed at 450 degrees C for 15 min and the solar cells completed by evaporating Au back contact on the CdTe layers after chemical etching. The results of the device measurements show drastic improvements in all the solar cell parameters (open-circuit voltage, short-circuit current density, fill factor and conversion efficiency) for the devices treated with CdCl2 + CdF2 mixture compared to those treated with only CdCl2. The conversion efficiencies increased from (1.0-3.0)% with CdCl2 treatment to about (5.0-7.0)% with CdCl2 + CdF2 treatment. The observed improvements have been attributed to the unique properties of fluorine. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：39 / 44
页数：6
相关论文
共 20 条
[1]   Halogen diffusion in a basaltic melt [J].
Alletti, Marina ;
Baker, Don R. ;
Freda, Carmela .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2007, 71 (14) :3570-3580
[2]  
[Anonymous], 2002, HDB CHEM PHYS
[3]   F and Cl diffusion in phonolitic melts: Influence of the Na/K ratio [J].
Balcone-Boissard, H. ;
Baker, D. R. ;
Villemant, B. ;
Boudon, G. .
CHEMICAL GEOLOGY, 2009, 263 (1-4) :89-98
[4]   Fluorine and chlorine diffusion in phonolitic melt [J].
Boehm, Anna ;
Schmidt, Burkhard C. .
CHEMICAL GEOLOGY, 2013, 346 :162-171
[5]   Cadmium telluride PV module manufacturing at BP Solar [J].
Cunningham, D ;
Rubcich, M ;
Skinner, D .
PROGRESS IN PHOTOVOLTAICS, 2002, 10 (02) :159-168
[6]   Fabrication of CdS/CdTe-Based Thin Film Solar Cells Using an Electrochemical Technique [J].
Dharmadasa, I. M. ;
Bingham, P. A. ;
Echendu, O. K. ;
Salim, H. I. ;
Druffel, T. ;
Dharmadasa, R. ;
Sumanasekera, G. U. ;
Dharmasena, R. R. ;
Dergacheva, M. B. ;
Mit, K. A. ;
Urazov, K. A. ;
Bowen, L. ;
Walls, M. ;
Abbas, A. .
COATINGS, 2014, 4 (03) :380-415
[7]   Review of the CdCl2 Treatment Used in CdS/CdTe Thin Film Solar Cell Development and New Evidence towards Improved Understanding [J].
Dharmadasa, I. M. .
COATINGS, 2014, 4 (02) :282-307
[8]  
Dharmadasa I. M., 2012, ADV THIN FILM SOLAR
[9]   Effects of multi-defects at metal/semiconductor interfaces on electrical properties and their influence on stability and lifetime of thin film solar cells [J].
Dharmadasa, IM ;
Bunning, JD ;
Samantilleke, AP ;
Shen, T .
SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2005, 86 (03) :373-384
[10]   Recent developments and progress on electrical contacts to CdTe, CdS and ZnSe with special reference to barrier contacts to CdTe [J].
Dharmadasa, IM .
PROGRESS IN CRYSTAL GROWTH AND CHARACTERIZATION OF MATERIALS, 1998, 36 (04) :249-290
12