Enhanced photo-response of CdTe Thin film via Mo doping prepared using electron beam evaporation technique
- PDF / 4,415,528 Bytes
- 14 Pages / 595.276 x 790.866 pts Page_size
- 30 Downloads / 215 Views
Enhanced photo-response of CdTe Thin film via Mo doping prepared using electron beam evaporation technique T. Manimozhi1,5,*, T. Logu2, J. Archana3, M. Navaneethan1,3, K. Sethuraman4, and K. Ramamurthi5,* 1
Nanotechnology Research Centre (NRC), SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Tokyo, Japan 3 Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India 4 Department of Materials Science, School of Technology, Central University of Tamil Nadu, Thiruvarur, India 5 Crystal Growth and Thin Film Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India 2
Received: 28 April 2020
ABSTRACT
Accepted: 5 October 2020
CdTe and 1–5 wt% molybdenum-doped CdTe materials were prepared by ball milling method. Then the ball-milled samples were deposited on a glass substrate at room temperature by an electron beam evaporation method. The structural, optical, morphological, electrical, and photo-response properties of CdTe and Mo-doped CdTe (CdTe:Mo) samples were investigated. The prepared samples exhibit a cubic structure of CdTe. X-ray diffraction pattern (XRD) showed that the deposited films belong to the cubic structure with a preferential growth along (111) plane. The peak shift in the lower side of 2h was observed due to incorporation of Mo into the CdTe matrix. Surface morphology of the prepared CdTe and CdTe:Mo ball-milled samples showed the formation of various agglomerated structures. Scanning electron microscope images depicted the formation of high dense agglomerated grains on the film surface with varying sizes as a function of Mo concentration. The optical bandgap was increased from 1.38 to 1.54 eV with raising the Mo concentration in CdTe films. Enhanced optical absorption coefficients (* 17 9 104 cm-1) were observed for 3 and 4 wt% Mo doped CdTe thin films. Hall measurement studies revealed that Mo doped CdTe (3 wt%) film possesses a low resistivity of 34 9 103 X cm. The CdTe and CdTe:Mo films exhibit p-type conduction. The high photo-response of 0.088 AW-1 is observed for 3 wt% Mo-doped CdTe thin film.
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Address correspondence to E-mail: [email protected]; [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04618-7
J Mater Sci: Mater Electron
1 Introduction As the earth is getting depleted of its fossil fuels, crucial pollution is making the world suffer, one among the solutions that are promising concerning the world energy crisis is the alternative form of energy resources. Converting solar energy into electrical energy is effectively done using solar cells. Thin-film solar cells are the most promising candidates due to their low cost and high conversion efficiency [1]. It is interesti
Data Loading...
