Role of Tin Chloride in Tin-Rich Mixed-Halide Perovskites Applied as Mesoscopic Solar Cells with a Carbon Counter Electrode

Cheng Min Tsai, Hui Ping Wu, Sun Tang Chang, Chi Feng Huang, Chia Hsin Wang, Sudhakar Narra, Yaw Wen Yang, Chien-Lung Wang, Chen Hsiung Hung, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

We report the synthesis and characterization of alloyed Sn-Pb methylammonium mixed-halide perovskites (CH3NH3SnyPb1-yI3-xClx) to extend light harvesting toward the near-infrared region for carbon-based mesoscopic solar cells free of organic hole-transport layers. The proportions of Sn in perovskites are well-controlled by mixing tin chloride (SnCl2) and lead iodide (PbI2) in varied stoichiometric ratios (y = 0-1). SnCl2 plays a key role in modifying the lattice structure of the perovskite, showing anomalous optical and optoelectronic properties; upon increasing the concentration of SnCl2, the variation of the band gap and band energy differed from those of the SnI2 precursor. The CH3NH3SnyPb1-yI3-xClx devices showed enhanced photovoltaic performance upon increasing the proportion of SnCl2 until y = 0.75, consistent with the corresponding potential energy levels. The photovoltaic performance was further improved upon adding 30 mol % tin fluoride (SnF2) with device configuration FTO/TiO2/Al2O3/NiO/C, producing the best power conversion efficiency, 5.13%, with great reproducibility and intrinsic stability.

Original languageEnglish
Pages (from-to)1086-1093
Number of pages8
JournalACS Energy Letters
Volume1
Issue number6
DOIs
StatePublished - 9 Dec 2016

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