Synthesis and Physical Properties of Solar Material Cu1-xLixInSe2

doi:10.15541/jim20160210

Abstract

Abstract:

Bulk materials of Li-doped Cu_1-_xLi_xInSe₂ (x = 0-0.4) were prepared by solid state reaction in evacuated and sealed quartz tubes at 873 K. To understand the physical properties of the materials, the structural, electrical and optical properties were systematically investigated. After doping with lithium, the samples crystallize in chalcopyrite structure with large grain sizes. Electrical resistivity and optical band gap of Li-doped Cu_1-_xLi_xInSe₂ are greatly enhanced to 2.73×10⁸ Ω·cm and 1.33 eV from original values of 1.98×10² Ω·cm and 0.9 eV, respectively. The large band gap improves the open circuit voltage, indicating that the Li-doping CuInSe₂ could be a promising material to future photovoltaic applications.

Key words: chalcopyrite structure, solar cell, bulk material, physical properties, CuInSe2

CLC Number:

TQ174

HUANG Rong-Tie, ZHENG Ming, SUI Li-Fang, CAI Chuan-Bing, HUANG Fu-Qiang. Synthesis and Physical Properties of Solar Material Cu_1-_xLi_xInSe₂[J]. Journal of Inorganic Materials, 2017, 32(1): 101-106.

Figures/Tables 5

Fig. 1 (a) XRD patterns of Cu1-xLixInSe2 (x = 0-0.4) sample (The inset showing details of the XRD patterns around 70° and 72°) and (b) variation of the lattice parameters a and c

Fig. 2 Typical Raman spectra of Cu1-xLixInSe2 (x = 0-0.4) samplesThe inset shows details of the Raman spectra from 150 to 200 cm-1

Fig. 3 SEM images of fractured surfaces of Cu1-xLixInSe2 (x = 0-0.4) samples(a) x = 0; (b) x = 0.2; (c) x = 0.4. Bar=10 μm

Fig. 4 Typical Nyquist plots of the electrochemical impedance spectra of Cu1-xLixInSe2 (x = 0-0.4) samplesThe inset shows the electrical resistivity with different doping contents at room temperature

Fig. 5 Diffuse reflectance spectra of Cu1-xLixInSe2 (x=0-0.4) samples (a) and the plots of (αhν)2 vs photon energy for Cu1-xLixInSe2 (x=0-0.4) samples (b)The inset shows the band gaps with different doping contents

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Synthesis and Physical Properties of Solar Material Cu_1-_xLi_xInSe₂

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