The effect of reaction temperature and time on CuInSe2 quantum dots by solvothermal method

Yunong Zhang,Zeyu Hou,Liang Zhang,Ying Yang,Xiaojie Jiang,Yingying Yang,Yanlai Wang

doi:10.1063/1.5135065

Abstract

The solvothermal method is used to prepare CuInSe2 quantum dots (QDs). This method mainly uses ethanolamine as a solvent with CuCl2·2H2O, InCl3·4H2O, and selenium powder used as raw materials. The powder morphology, phase, and light absorption characteristics of different reaction temperatures and times were characterized in this work. Other characterization methods were used to optimize the CuInSe2QDs. It was substantiated that the optimum reaction condition is at 180 °C for 20 h, the proportion of Cu, In, and Se is 1:2:1, the particle size is 10 nm, and the emission peak is at 800 nm. Furthermore, the CuInSe2QDs with the best performance were adsorbed on the TiO2 film, and it was concluded that TiO2 could be successfully decorated via the CuInSe2QDs, and the absorption band edge was enlarged to enhance the light absorption performance.

Highlights

Increasing the photoelectric conversion efficiency of quantum dots (QDs) sensitized solar cells is mainly manifested in the following two aspects:1,2 one is to increase the absorption range of the photoanode and to enhance the absorption intensity of the photoanode; the second is to accelerate the electron mobility
The EDX analysis of CuInSe2 quantum dots shows that the content of Cu and Se increases relatively with the increase of temperature
When the temperature is continuously raised to 180 ○C, the atomic ratio of Cu:In:Se is close to 1:1:1

Summary

INTRODUCTION

Increasing the photoelectric conversion efficiency of QD sensitized solar cells is mainly manifested in the following two aspects: one is to increase the absorption range of the photoanode and to enhance the absorption intensity of the photoanode; the second is to accelerate the electron mobility. Ternary CuInSe2(CISe) is considered to be a good direct bandgap semiconductor material It has the advantages of high light absorption coefficient and good photoelectric conversion efficiency, and has stable performance and simple preparation method, which has attracted the attention of photovoltaic researchers at home and abroad.. Chalcopyrite CISeQDs were prepared via the solvothermal method and the diffraction peaks were found at 26.6○, 44.23○, and 52.39○ by XRD analysis, which can be indexed to the (112), (220), and (312) crystal planes, respectively It proves the synthesis of CISe phases. Scitation.org/journal/adv adsorbed by TiO2, the absorption band edge was enlarged, and the light absorption intensity was enhanced

Preparation process of CISe quantum dots

Different reaction temperatures

Different reaction times

Characteristics of CuInSe2 quantum dots adsorbed by TiO2

CONCLUSIONS