Stability Improvement of Perovskite Solar Cells by Adding Sb‐Xanthate to Precursor Solution

• Published in: Physica status solidi. A, Applications and materials science Vol. 217; no. 18
• Main Authors: Nam, Kyung-Su, Krishnamurthy, Suvratha, Qing, Shen, Toyoda, Taro, Yoshino, Kenji, Minemoto, Takashi, Ma, Tingli, Pandey, Shyam, Hayase, Shuzi
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.09.2020
• Subjects: Baking; Fluorine; Gold; passivation; Passivity; perovskite solar cells; Perovskites; Photoelectrons; Photovoltaic cells; Polyvinyl carbazole; Precursors; Silver; Solar cells; Stability; Substrates; Tin oxides; Titanium dioxide; xanthate
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.202000144

Herein, it is reported that the stability of a halogenated perovskite (PVK) solar cell consisting of an fluorine‐doped tin oxide (FTO) substrate/TiO2/CH3NH3PbI3/N2,N2,N2′,N2′,N7,N7,N7′,N7′‐octakis(4‐methoxyphenyl)‐9,9′‐spirobi[9H‐fluorene]‐2,2′,7,7′‐tetramine/Ag/Au structure is improved by adding Sb‐xanthate to the PVK layer without large loss of efficiency. The Sb‐element‐rich layer is observed on top of the PVK layer. From the X‐ray photoelectron spectroscopy (XPS) study, it is concluded that an inorganic SbxOy passivation layer on the PVK layer is prepared by baking the solution of the Sb‐xanthate and the PVK precursor. The inorganic layer prevents moisture and oxygen from penetrating into the PVK layer. This article provides a new method to obtain a passivation layer on a PVK layer by baking a mixture solution in one step for improving solar cell stability. An MAPbI3 perovskite (PVK) solar cell's stability is improved by adding a small amount of Sb‐xanthate in the precursor solution. By adding 1% Sb‐xanthate to the PVK, the stability of cells without encapsulation under ambient atmosphere (air) is drastically improved without large efficiency loss.