Polyol Modification of PEDOT: PSS as Hole Transport Material Affects the Performance and Stability of Calcium Titanate (CaTiO₃) Solar Cell and UV Photodetector

¹ Department of Chemical Engineering, Institut Teknologi Kalimantan, Jl. Soekarno Hatta, Balikpapan 76127, East Kalimantan, Indonesia.
² Department of Electrical Engineering, Institut Teknologi Kalimantan, Jl. Soekarno Hatta, Balikpapan 76127, East Kalimantan, Indonesia.
³ Department of Engineering Physics, Institut Teknologi Sepuluh November, Jl. Teknik Kimia, Surabaya 60111, East Java, Indonesia
⁴ Institute of Physical Chemistry, Friedrich Schiller University, Fürstengraben 1, 07743 Jena, Germany

^* Corresponding author: lusiernawati@lecturer.itk.ac.id

Abstract

This report a novel and straightforward architecture of CaTiO₃based solar cells with optimized hole transport material (HTM) properties. The perovskite CaTiO₃ particle was prepared via the solution process using different CaCO₃/TiO₂ ratios. The design of CaTiO₃-based solar cell follows the inverted architecture, in which poly (4-styrene sulfonate)-doped poly (3, 4-ethylenedioxy-thiophene (PEDOT:PSS) and PCBM-C70 were used as HTM and electron transport layer (ETL), respectively. Charge mobility of HTM was modified and improved by using either ethylene glycol (EG) or diethylene glycol (DEG). The optimum condition of CaTiO₃-based solar cell was obtained using CaCO₃/TiO₂ ratio of (1:7) annealed at 900 °C and 44.4 % (v/v) DEG-modified PEDOT/PSS. The conversion efficiency of 3.1 % with a stable solar cell performance up to 72 h under the ambient condition without encapsulation was achieved.