Presentation Information
[9p-P06-3]Development of Highly Efficient Perovskite Solar Cells via Additive-Assisted Defect Passivation Using Structural Isomer Effect
Yu Na Choi1, Yeon Woo Seok1, Ji Yoon Kim1, 〇Taewoong Kim1 (1.Konkuk University)
Keywords:
Hybrid Perovskite,Solar Cell,Structural Isomer
Additive engineering has been widely studied for the development of highly efficient and stable hybrid perovskite solar cells (PSCs) and shown considerable improvements in promoting grain growth of hybrid perovskite, reduction of trap density, etc. Particularly, various research concerning new additives for mitigation of defects such as uncoordinated Pb2+ ions have been actively conducted, and remarkable results have been reported. Although various research of the additive engineering for mitigation of defects has been executed successfully, the research has mainly concentrated on discovering new additives and there has been almost no effort to passivate defects by modifying the additives themselves. For this reason, a comprehensive exploration of functional group positioning in additives for passivation of defects is well worth considering for further improvement beyond conventional additives.
In this study, we explore the use of L-alanine methyl ester hydrochloride (L-AMECl) and β-alanine methyl ester hydrochloride (β-AMECl)—structural isomers featuring both carbonyl and amine groups—as multifunctional additives for hybrid perovskite absorber modification. These additives were introduced into the hybrid perovskite precursor solution and their influence on film morphology, defect density, and device performance was systematically investigated. According to our investigation, β-AMECl, a structural isomer of L-AMECl, is superior in passivation of defects in hybrid perovskite films and, thus, in enhancing photovoltaic parameters. Consequently, we achieved power conversion efficiency (PCE) of 24.25%, with the structural isomer β-AMECl. Furthermore, the β-AMECl-enhanced PSCs showed improved long-term stability of over 16% and 4% compared to those of the control and L-AMECl-added PSCs, respectively (2500 h in atmospheric conditions).
In this study, we explore the use of L-alanine methyl ester hydrochloride (L-AMECl) and β-alanine methyl ester hydrochloride (β-AMECl)—structural isomers featuring both carbonyl and amine groups—as multifunctional additives for hybrid perovskite absorber modification. These additives were introduced into the hybrid perovskite precursor solution and their influence on film morphology, defect density, and device performance was systematically investigated. According to our investigation, β-AMECl, a structural isomer of L-AMECl, is superior in passivation of defects in hybrid perovskite films and, thus, in enhancing photovoltaic parameters. Consequently, we achieved power conversion efficiency (PCE) of 24.25%, with the structural isomer β-AMECl. Furthermore, the β-AMECl-enhanced PSCs showed improved long-term stability of over 16% and 4% compared to those of the control and L-AMECl-added PSCs, respectively (2500 h in atmospheric conditions).