Effects of TiO2 Properties on Performance of CH3NH3PbI3 Perovskite Photovoltaic Cells. Issue 47 (19th April 2016)

• Record Type: Journal Article
• Authors: Adli, Hasyiya K.; Harada, Takashi; Ito, Seigo; Nakanishi, Shuji; Ikeda, Shigeru
• Is Part Of: MRS advances. Volume 1:Issue 47(2016)
• Page Start: 3185
• Page End: 3190
• Publication Date: 2016-04-19
• Subjects: photovoltaic, -- x-ray diffraction (XRD), -- solution deposition; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2016.272
• Languages: English
• ISSNs: 2059-8521

Abstract

ABSTRACT: The effects of TiCl4 post-treatment on the physicochemical properties of porous TiO2 ( p TiO2 ) layers fabricated at 300 °C and 400 °C (denoted as p TiO2 (300) and p TiO2 (400), respectively) in CH3 NH3 PbI3 perovskite photovoltaic cells were investigated. Water contents (physisorbed water and water derived from surface hydroxyl groups) of p TiO2 (300) and p TiO2 (400) before and after TiCl4 post-treatment were measured by using temperature desorption spectroscopy (TDS). Moreover, structural analysis of the CH3 NH3 PbI3 perovskite part was performed by X-ray diffraction (XRD). In the case of p TiO2 (300), the content of water was increased by the TiCl4 post-treatment due to the removal of residual organic compounds that existed before the treatment. It then caused a change in the surface activity of p TiO2 (300) and enhancement of solar cell performance and photocurrent density, though suppression of CH3 NH3 PbI3 perovskite formation occurred. In comparison, contents of water were decreased for p TiO2 (400), leading to enhancement of the conversion of PbI2 to CH3 NH3 PbI3 perovskite. As a result, there were significant increases in short circuit current density (Jsc s) and PCEs. The results showed that TiCl4 post-treatment is an effective approach to prepare high-performance CH3 NH3 PbI3 perovskite solar cells without heat treatment at a very high temperature.