| Autor: |
Aslam, Sameen, Rashid, Marzaini, Hashim, Md. Roslan, Pakhuruddin, Mohd Zamir, Arshad, Suhana, Samsuri, Siti Azrah Mohamad |
| Zdroj: |
Emergent Materials; 20240101, Issue: Preprints p1-10, 10p |
| Abstrakt: |
The outstanding optoelectronic properties of titanium-based halides perovskite make them highly desirable for replacing lead-based halides perovskite in solar cells. This study presents a one-step solution method to synthesize the titanium mixed halides perovskite, Cs2TiBr2I4, using inverse temperature crystallization method. The potential of Cs2TiBr2I4as a solar cell light harvester is explored. X-ray diffraction shows that Cs2TiBr2I4perovskite possesses cubic crystal structure with a lattice parameter of 11.17 Å and an average crystallite size of 25 nm. Energy Dispersive X-ray Spectroscopy (EDS) confirms the atomic % composition of Cs2TiBr2I4perovskite. Optical analysis reveals strong absorption in 350 nm and 680 nm spectral range, making this material a potential candidate for solar energy conversion applications. The direct and indirect optical energy gaps are calculated as 1.65 eV and 1.59 eV, respectively. Electrical characterization shows n-type conduction with a carrier concentration of 4.6 × 1013cm− 3and mobility of 2.63 cm2/Vs. Cs2TiBr2I4perovskite-based photodetectors exhibit photoconductive behavior with a strong response to visible light. More importantly, the Cs2TiBr2I4film is adopted as a light absorber layer for a lead-free perovskite solar cell with structure ITO/TiO2/Cs2TiBr2I4/Spiro-OMeTAD/Au. A preliminary estimation of the power conversion efficiency (PCE) yielded approximately 0.035%, with an open-circuit voltage of 0.73 V under an incident light intensity of 45 mW/cm2. This achievement marks the first instance of employing the Cs2TiBr2I4film as a light absorber layer in a lead-free perovskite solar cell. We hope this study provides beneficial insights into developing low-cost and non-toxic lead-free double perovskites for optoelectronic applications. |
| Databáze: |
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