Vol. 25, No. 1, pp. 67-72, 2023 Uzbek Journal of Physics 25(1), 67-72, 2023. DOI: https//doi.org/ 10.52304/.v25i1.408 67 Improving parameters of inorganic perovskite solar cells by more than one spin coating method Erkin Zakhidov 1 , Sherzod Nematov 2 , Aziz Saparbaev *,1,3 , Tajibaev Ilkhomjon 1 , Lobar Nurumbetova 1 , Boburbek Khidirov 1 , Ilhom Boynazarov 1 , Abror Turgunboev 1 , Farid Ruziyev 1 1 Institute of Ion-Plasma and Laser Technologies, Uzbekistan Academy of Sciences, Durmon Yuli st. 33, 100125, Tashkent, Uzbekistan 2 Tashkent State Technical University named after Islom Karimov, University st. 2, 100174, Tashkent, Uzbekistan 3 National University of Uzbekistan named after Mirzo Ulugbek, University st. 4, 100174, Tashkent, Uzbekistan Received 13.03.2023, revised 25.03.2023 *Corresponding author: e-mail: saparbaevaziz83@gmail.com, Phone +998 88 78014 41 В этой работе сообщается о процессе изготовления перовскитных пленок с морфологией хорошего качества и оптимальной толщины с помощью простого процесса более чем одного спин коатинга или метода множественного спин коатинга (MSC). Следует отметить, что перовскитные пленки с хорошей морфологией и оптимальной толщиной получаются без применения антирастворителей в условиях полного воздуха. В этой работе мы получили оптимальное хорошее значение эффективности преобразования энергии для CsPbI 3 перовскитных солнечных элементов на уровне 11.69%. Хотя результат эффективности преобразования энергии недостаточно высок, тем не менее этот метод MSC обеспечивает простой и несложный подход к изготовлению перовскит- ных солнечных элементов. Ключевые слова: перовскит CsPbI 3 ; многократное покрытие, солнечные элементы; мо- дификация поверхности, антирастворитель. This work reports the fabrication process for preparation of perovskite films with good quality morphology and optimal thickness by a simple process of more than one spin coating or mul- tiple spin coating (MSC) method. It should be noted that perovskite films with good quality morphology and optimal thickness are prepared without antisolvent engineering in full air conditions. In this work, we obtained an optimal good power conversion efficiency (PCE) val- ue for CsPbI 3 perovskite solar cells (PSCs) at 11.69%. Although, the PCE result is not high enough, however, this MSC method provides a simple and uncomplicated approach for fabri- cation of PSCs. (PCE) value for at 11.69%. CsPbI 3 . Keywords: CsPbI 3 perovskite; multiple coating; solar cells; surface modification; antisolvent engineering. I. Introduction Perovskite materials are among the most abun- dant elements on Earth, and perovskites are notable for their low cost and low energy consumption in the manufacturing of solar cells. So, it will be very suita- ble for large-scale production techniques in the future. There has been considerably large amount of attention paid to improvement of performance and simplifica- tion of manufacturing processes based on perovskite photovoltaic technology. However, there are many challenges in the field of PSCs for achieving these goals. The major challenge is to prepare quality pe- rovskite solution and its coating for perovskite films with high quality morphology. The issues like limited solubility of perovskite materials in solution and very complex fabrication process stand in the way of solv- ing this problem [1-5]. To solve such problems and improve the efficiency of organic and inorganic PSCs, various techniques have been developed to uniformly