Pengaruh Variasi Doping Cs dalam Lapisan Tipis Perovskit FA1-XCsxPbI3 (X=0-1) Terhadap Struktur, Morfologi, dan Sifat Optoelektronika

Sitompul, Karina Belinda Alsi (2026) Pengaruh Variasi Doping Cs dalam Lapisan Tipis Perovskit FA1-XCsxPbI3 (X=0-1) Terhadap Struktur, Morfologi, dan Sifat Optoelektronika. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5001221026-Undergaduate-Thesis.pdf - Accepted Version Restricted to Repository staff only Download (4MB) | Request a copy

Abstract

Material perovskit hibrida organik-anorganik telah berkembang pesat sebagai salah satu material fungsional yang paling menjanjikan dalam pengembangan aplikasi sel surya. Hal ini disebabkan oleh karakteristik optik yang unggul seperti nilai celah pita energi (bandgap) yang dapat direkayasa melalui modifikasi komposisi material. Salah satu pendekatan untuk meningkatkan stabilitas dan kualitas kristal perovskit adalah dengan melakukan substitusi kation pada struktur A-site, seperti doping Cesium (Cs) pada perovskit berbasis Formamidinium timbal iodida (FAPbI3). Penelitian ini berfokuskan untuk mengkaji pengaruh variasi doping Cs pada lapisan tipis perovskit FA1-xCsxPbI3 dengan variasi nilai x = 0; 0,15; 0,25; 0,50; 0,75; dan 1 terhadap struktur perovskit, morfologi permukaan, serta sifat optoelektronika. Sintesis dilakukan di atmosfer dengan metode ultrasonikasi. Hasil analisis XRD menunjukkan bahwa komposisi doping Cs (x=0,15) memiliki kestabilan fase alfa terbaik dengan persentase fase sebesar 92,06% pada hari ke-0 dan tetap mempertahankan 80,77% hingga hari ke-5, sementara komposisi doping Cs (x=0,25) menunjukkan dominasi fase beta dengan persentase 92,29% pada hari ke-0 yang bertahan hingga 79,63% pada hari ke-5 pada suhu ruang. Hasil karakterisasi SEM memperlihatkan bahwa doping Cs sebesar x=0,15 menghasilkan morfologi film dengan ukuran butir yang besar dan batas butir yang jelas sehingga dinilai paling optimal, sedangkan peningkatan konsentrasi Cs hingga x=0,25 terbukti memperkecil ukuran butir seiring meningkatnya substitusi kation Cs+. Analisis UV-Vis menunjukkan bahwa celah pita optik material meningkat secara konsisten seiring bertambahnya konsentrasi Cs, dari 1,32 eV pada sampel tanpa doping (x=0) hingga 1,97 eV pada CsPbI3 (x=1).
====================================================================================================================================
Organic-inorganic hybrid perovskite materials have developed rapidly as one of the most promising functional materials in the development of solar cell applications. This is due to their superior optical characteristics such as energy bandgap values that can be engineered through material composition. One approach to improve the stability and quality of perovskite crystals is by substituting cations in the A-site structure, such as Cesium (Cs) doping in Formamidinium lead iodide (FAPbI3) based perovskites. This study focuses on examining the effect of variations in Cs doping on thin films of FA1-xCsxPbI3 perovskites with varying values of x = 0; 0,15; 0,25; 0,50; 0,75; and 1 on the structure, surface morphology, and optoelectronic properties. Synthesis was carried out in the atmosphere by ultrasonication method. The results of XRD analysis showed that the Cs doping composition (x=0,15) had the best alpha phase stability with a phase percentage of 92,06% on day 0 and maintained 80,77% until day 5, while the Cs doping composition (x=0,25) showed a beta phase dominance with a percentage of 92,29% on day 0 which persisted to 79,63% on day 5 at room temperature. The SEM characterization results showed that Cs doping of x=0,15 produced a film morphology with a large grain size and clear grain boundaries so that it was considered the most optimal, while increasing the Cs concentration to x=0,25 was proven to reduce the grain size as the Cs+ cation substitution increased. UV-Vis analysis showed that the optical band gap of the material increased consistently with increasing Cs concentration, from 1,32 eV in the undoped sample (x=0) to 1,97 eV in CsPbI3 (x=1).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Celah pita, Drop Casting, Perovskit FA1-xCsxPbI3, Subtitusi Ion Cesium ======================================================================================================================== Band Gap, Drop Casting, Perovskite FA1-xCsxPbI3, Cesium Ion Substitution
Subjects:	Q Science Q Science > QC Physics Q Science > QC Physics > QC162 Adsorption and absorption Q Science > QC Physics > QC451 Spectroscopy
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Karina Belinda Alsi Sitompul
Date Deposited:	28 Jul 2026 03:03
Last Modified:	28 Jul 2026 03:03
URI:	http://repository.its.ac.id/id/eprint/138429

Actions (login required)

View Item