Study On Fabrication Of Semi-Transparent Perovskite Solar Cells

In the past few years,the photoelectric conversion efficiency of silicon solar cells has been approaching its theoretical limit,thus raised the requirement of tandem solar cells.With rapid development,the efficiency of perovskite solar cells（PSCs）,which is considered to be the ideal material as component of tandem solar cells,has reached 25.2%.In order to prepare tandem solar cells with silicon,research of semi-transparent PSCs preparation method is needed.This paper researched the preparation method and performance of semi-transparent PSCs.Through researching of sputter method of ITO film at room temperature,enough electrical and optical performances were achieved for ITO film.The semi-transparent PSC was prepared successfully by utilizing MoO₃ buff layer.Through utilizing inorganic hole transfer layer（HTL）CuSCN,semi-transparent PSC without buffer layer was obtained.In order to improve the stability of CuSCN-based PSCs,the interface between CuSCN and metal electrode was researched and its mechanism of reaction process and influence to performance was analyzed.The main contents are as follows:（1）The influence of sputter time to ITO film at room temperature was researched.The ITO film with enough low sheet resistance was obtained.Then the influence of sputter voltage to electrical performance of ITO film was researched.The sputter voltage was controlled to avoid the insufficient carrier or severe break of O bonds.The influence of oxygen partial pressure to ITO electrical properties was researched.The mobility of ITO was improved.Through analysis of transmittance spectra at various wavelength,the influence of sputter voltage and oxygen partial pressure to interference and reflection of light was researched.（2）Base on PSC of n-i-p structure,semi-transparent PSC was prepared through utilizing of MoO₃ buff layer.Through control the assignment of sputter time,the yield and performance of devices was improved.Meanwhile,the influence of MoO₃thickness to performance was researched.Through utilizing of inorganic HTL CuSCN,semi-transparent PSC without buff layer was prepared.Simpler method,cheaper prize and better stability were achieved.（3）The interface between CuSCN and metal electrode was researched.Through controlling the thickness of electrode,process of interface reaction was analyzed.The core level peak shift of metal and generation of Cu²⁺in XPS spectra were observed,thus the disproportionation of Cu⁺was confirmed.The mechanic of influence of this reaction to device performance was analyzed and confirmed through various experiments.