Performance enhancement of cost-effective mixed cationic perovskite solar cell with MgCl2 and n-BAI as surface passivating agents

• Published in: Optical materials Vol. 132; p. 112845
• Main Authors: Khare, Shubham, Gohel, Jignasa V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2022
• Subjects: Additive engineering; EIS; JV-Characteristics; MgCl2; n-BAI; Perovskite solar cells; Additive engineering; n-BAI; JV-Characteristics; MgCl2; EIS; Perovskite solar cells
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2022.112845

The perovskite layer and its composition play a vital role in the fabrication of perovskite solar cells (PSCs) in order to achieve high power conversion efficiency (PCE) with great stability. The use of mixed cations in the perovskite layer could lead to PCE up to 25.8% in 2021. However, due to the effect of environmental factors such as heat and moisture, the perovskite layer shows undesirable degradation and lead leakage. This hindrance can be solved by the use of surface passivation and additive engineering strategies along with the knowledge of thermal stress testing. In the present study, optoelectronic properties and stability of mixed cationic perovskite solar cell have been successfully enhanced by two additives, namely, MgCl2 and n-BAI. The impact of its concentration on optoelectronic properties and stability of mixed cationic PSC is also investigated in detail. The results show that, 2 mol% n-BAI (used as an additive) on perovskite layer enhances the photovoltaic properties of perovskite and it gives superior stability against environmental stressors. The PCE of cell increases by 39.86% (from 5.92% to 8.28%) post additive engineering. PSC sample treated with 2 mol% n-BAI shows substantial increase in hydrophobicity. Treated cell gives superior PCE retention as compared to untreated sample. Also, the treated sample shows promising stability results compared to untreated cell, after stress testing by international standards (along with superior resistance against recombined electrons). Thus, the present work will open the means for successful commercialization of mixed cation PSCs. [Display omitted] •Mixed cationic PSCs surface passivation for the first time by MgCl2 and n-BAI additives.•Enhanced stability and morphological and optoelectronic properties of champion PSC.•Analysis of optoelectronic properties and stability results for champion PSC.•Thermal stress testing of champion cell by International (IEC) standards.