<![CDATA[Organic solar cells (OSCs) are one of the third-generation photovoltaic technologies that offer advantages in the form of mechanical flexibility, light weight, and potential low production costs. However, power conversion efficiency and operational stability of the device are still the main challenges that limit its commercial application. This study aims to analyze the effect of variations in the thickness of the active layer, energy bandgap, and the addition of a buffer layer on increasing the efficiency and stability of organic solar cells based on the donor-acceptor pair D18:L8-BO. The research method uses a modeling approach and numerical simulation with OghmaNano software based on the drift-diffusion model. Variations in the thickness of the active layer are simulated in the range of 120–170 nm and the energy bandgap in the range of 1.3–1.8 eV under standard AM 1.5G illumination (1000 W/m²). The performance parameters analyzed include open circuit voltage (Voc), short circuit current (Isc), Fill Factor (FF), and Power Conversion Efficiency (PCE). The simulation results show that the optimum active layer thickness is in the range of 130–140 nm, with a maximum PCE value of 18.33%, Voc of 1.21 V, Isc of 10.12 mA/cm², and FF of 0.67 at a bandgap of 1.8 eV. In addition, the addition of the TPBi buffer layer can improve the thermal stability of the device by maintaining more than 95% of the initial efficiency after simulated operation for up to 2000 hours. These findings indicate that optimization of structural parameters through a numerical simulation approach can improve the efficiency and stability of D18:L8-BO-based OSC devices. This research provides an important contribution in the design of high-performance organic solar cells and has the potential to support the development of more efficient and sustainable renewable energy technologies. ABSTRAK (Bahasa Indonesia) Sel surya organik (Organic Solar Cell/OSC) merupakan salah satu teknologi fotovoltaik generasi ketiga yang menawarkan keunggulan berupa fleksibilitas mekanik, bobot ringan, dan potensi biaya produksi rendah. Namun demikian, efisiensi konversi daya dan stabilitas operasional perangkat masih menjadi tantangan utama yang membatasi penerapan komersialnya. Penelitian ini bertujuan untuk menganalisis pengaruh variasi ketebalan lapisan aktif, bandgap energi, serta penambahan lapisan buffer terhadap peningkatan efisiensi dan stabilitas sel surya organik berbasis pasangan donor–akseptor D18:L8-BO. Metode penelitian menggunakan pendekatan pemodelan dan simulasi numerik dengan perangkat lunak OghmaNano berbasis model drift–diffusion. Variasi ketebalan lapisan aktif disimulasikan pada rentang 120–170 nm dan bandgap energi pada rentang 1,3–1,8 eV di bawah iluminasi standar AM 1.5G (1000 W/m²). Parameter kinerja yang dianalisis meliputi tegangan rangkaian terbuka (Voc), arus hubung singkat (Isc), Fill Factor (FF), dan Power Conversion Efficiency (PCE). Hasil simulasi menunjukkan bahwa ketebalan lapisan aktif optimum berada pada kisaran 130–140 nm, dengan nilai PCE maksimum sebesar 18,33%, Voc 1,21 V, Isc 10,12 mA/cm², dan FF 0,67 pada bandgap 1,8 eV. Selain itu, penambahan lapisan buffer TPBi mampu meningkatkan stabilitas termal perangkat dengan mempertahankan lebih dari 95% efisiensi awal setelah simulasi operasi hingga 2000 jam. Temuan ini menunjukkan bahwa optimasi parameter struktural melalui pendekatan simulasi numerik dapat meningkatkan efisiensi sekaligus stabilitas perangkat OSC berbasis D18:L8-BO. Penelitian ini memberikan kontribusi penting dalam perancangan sel surya organik berperforma tinggi dan berpotensi mendukung pengembangan teknologi energi terbarukan yang lebih efisien dan berkelanjutan.]]>
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