Sintesis dan Karakterisasi Optoelektronik Perovskit Non-Timbal FASnI3-xClx (x=0;1;2) dengan Agen Penstabil Asam Askorbat

Permatasari, Wilda Meylina (2025) Sintesis dan Karakterisasi Optoelektronik Perovskit Non-Timbal FASnI3-xClx (x=0;1;2) dengan Agen Penstabil Asam Askorbat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perovskit berbasis timah (Sn) menjadi alternatif menarik untuk menggantikan perovskit berbasis timbal (Pb) dalam aplikasi optoelektronik karena efisiensi konversi energi yang tinggi dan sifat ramah lingkungan. Namun, perovskit ini rentan terhadap degradasi akibat oksidasi Sn2+ menjadi Sn4+, yang mengurangi kestabilannya. Penelitian ini bertujuan untuk mengetahui pengaruh substitusi ion Cl⁻ dan peran asam askorbat (AA) dengan variasi 10% dan 20% terhadap kestabilan dan sifat optoelektronik perovskit non timbal FASnI3-xClx (x=0;1;2). Sintesis dilakukan dengan metode drop casting pada substrat kaca, yang kemudian dipanaskan pada suhu 130˚C di atmosfer biasa tanpa penggunaan glove box. Karakterisasi sampel mencakup pengamatan visual untuk menganalisis perubahan warna, analisis struktur kristal menggunakan X-ray Diffraction (XRD), analisis morfologi permukaan film tipis melalui Scanning Electron Microscopy (SEM)/EDX serta pengukuran energi celah pita menggunakan Vis-spektrofotometer, Hasil penelitian menunjukkan bahwa substitusi ion Cl⁻ dan penambahan AA berperan penting dalam meningkatkan kestabilan serta mengoptimalkan sifat optoelektronik FASnI3-xClx. Ketahanan sampel terhadap degradasi bervariasi, dengan sampel FASnI3 (x=0) bertahan ±1 hari, sampel x=1 bertahan ± 5 hari, dan sampel x=2 bertahan ± 4 hari. Sampel dengan substitusi Cl⁻ pada x=1 dan penambahan AA 20% menunjukkan kestabilan tertinggi, ditandai dengan dominasi fasa utama perovskit dan energi celah pita sebesar 1,42 eV pada hari ke-3, yang berada dalam rentang ideal untuk aplikasi fotovoltaik. Hal ini menunjukkan bahwa penambahan ion Cl⁻ dan AA yang sesuai dapat memperbaiki kestabilan fasa dan mempertahankan performa optoelektronik material perovskit non-timbal.
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Tin-based perovskites (Sn) have emerged as a promising alternative to lead-based (Pb) perovskites for optoelectronic applications due to their high energy conversion efficiency and environmentally friendly properties. However, these materials are highly susceptible to degradation caused by the oxidation of Sn2+ to Sn4+, which compromises their structural stability. This study aims to investigate the effect of chloride (Cl⁻) substitution and the role of ascorbic acid (AA) at concentrations of 10% and 20% on the stability and optoelectronic properties of lead-free perovskites FASnI3-xClx (x = 0, 1, 2). The films were synthesized via the drop-casting method on glass substrates, followed by annealing at 130 °C in ambient conditions without a glove box. Characterizations included visual inspection to monitor color change, crystal structure analysis using X-ray Diffraction (XRD), surface morphology evaluation using Scanning Electron Microscopy (SEM)/EDX, and band gap determination via visible spectroscopy (Vis-spectrophotometry). The results indicate that both Cl⁻ substitution and AA addition play a critical role in enhancing stability and optimizing the optoelectronic performance of FASnI3-xClx. The degradation resistance varied across the samples, the pristine FASnI3 (x = 0) degraded within approximately one day, while samples with x = 1 and x = 2 remained stable for approximately five and four days, respectively. Notably, the sample with x = 1 Cl⁻ substitution and 20% AA exhibited the highest stability, as evidenced by the dominance of the perovskite phase and a band gap of 1,42 eV on day 3 an optimal value within the ideal range for photovoltaic applications. These findings demonstrate that appropriate Cl⁻ incorporation combined with AA stabilization effectively improves phase stability and maintains the optoelectronic performance of lead-free perovskite materials.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Asam Askorbat, Dimetilformamida, Drop Casting, FASnI3-xClx, Perovskit Non-Timbal, Ascorbic Acid, Dimethylformamide, Drop Casting, FASnI3-xClx, Lead-Free Perovskite.
Subjects:	Q Science > QC Physics > QC100 Crystals. Q Science > QC Physics > QC451 Spectroscopy
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Wilda Meylina Permatasari
Date Deposited:	28 Jul 2025 01:40
Last Modified:	28 Jul 2025 01:40
URI:	http://repository.its.ac.id/id/eprint/121878

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