Flexible Substrate‐Structured Sb2S3 Solar Cells with Back Interface Selenization

Author:

Deng Hui12ORCID,Cheng Yingshun1,Chen Zekun1,Lin Xiao1,Wu Jionghua1,Zheng Qiao1,Zhang Caixia1,Cheng Shuying123

Affiliation:

1. College of Physics and Information Engineering Institute of Micro‐Nano Devices and Solar Cells Fuzhou University Fuzhou 350108 P. R. China

2. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 P. R. China

3. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou 213164 P. R. China

Abstract

AbstractAntimony sulfide (Sb2S3) with a 1D molecular structure has strong bending characteristics, showing great application potential in flexible devices. Herein, the flexible substrate‐structured Sb2S3 solar cells is developed and improve device performances by the back interface selenization. The high‐quality Sb2S3 film with an optimal thickness of 1.8 µm, ensuring efficient spectra utilization, is deposited on flexible Mo foils by the rapid thermal evaporation technique. To solve the issues of back interfacial recombination and charge transport, the 20 nm MoSe2 layer between Sb2S3 film and Mo foil is fabricated by substrate selenization in the tube furnace. Further investigations indicate that the MoSe2 layer improves the interfacial energy band alignments and induces the [hk1] orientation of Sb2S3 film, thereby passivating defects and enhancing the carrier transport capacity. The flexible solar cell in the structure of Mo foil/MoSe2/Sb2S3/CdS/ITO/Ag, exhibiting good flexibility to stand thousands of bending, achieves an efficiency of 3.75%, which is the highest for Sb2S3 devices in substrate configuration. The presented flexible structure and back interfacial selenization study will provide new prospects for inorganic Sb2S3 thin film solar cells.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Fujian Province

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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