Incorporation of Perovskite Cs2SnI6 into Dye Sensitized Solar Cell Structure and Its Optimization
Amaldeus Tani Dosi, Setiya Rahayu, Priastuti Wulandari*

Physics of Magnetism and Photonic Research Division,
Faculty of Mathematics and Natural Sciences,
Institut Teknologi Bandung
Jl. Ganesha 10 Bandung 40132, West Java, Indonesia

*wulan[at]fi.itb.ac.id

Abstract

Dye Sensitized Solar Cell (DSSC) technology has become considerable research in the last two decades in the field of energy conversion. DSSC is one of the most promising types of solar cells among third generation solar cells due to the ease of fabrication process. Several studies have been conducted to improve DSSC performance, for example by modifying the structure of DSSC or by adding materials such as lead and tin-based perovskite, as well as gold and silver metal nanoparticles. On the other hand, lead-based perovskite (Sn) is considered to replace lead-based perovskite (Pb) because the Pb is toxic, and it has a negative impact on the environment. It has been known that Cs2SnI6 perovskite material is more stable in air and can be synthesized in an air environment.

In this study, we attempt to incorporate Cs2SnI6 perovskite into N-719 dye solution to increase photon absorbance or to enhance electron transport regarding to enhance the performance of DSSC. In our experiment, Cs2SnI6 was successfully synthesized chemically at room temperature by mixing cesium carbonate (Cs2CO3) into of hydroiodic acid (HI) as a solvent and stannic iodide (SnI4) in warm ethanol to form a precipitate. The absorbance spectra of Cs2SnI6 perovskite show two specific peaks at wavelength of 293 nm and 362 nm. The energy band gap obtained by the Tauc-Plot method is about 3.1 eV. The performance of our fabricated DSSC device was done by J-V measurement. In our experiment, the addition of 1 mg/mL of Cs2SnI6 perovskite solution into DSSC structure reveals the highest PCE value of 3.97%. However, the PCE value was drastically reduced from 4.03% in the 1st week to 1.07% in the 9th week for the case of addition ethanol solvent in perovskite.

Keywords: Dye Sensitized Solar Cell (DSSC), Cs2SnI6 perovskite.

Topic: Magnetism and Photonics