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Accelerating Additive-Assisted Defect Passivation via the Structural Isomer Effect for Highly Efficient and Stable
Ho Dong Son1, Sangsu Lee1, Kyusun Kim1,2
1Department of Energy Materials Science & Engineering, College of Science and Technology, Konkuk University, Chungju, Chungcheongbuk-do 27478, Republic of Korea.
ACS Applied Materials & Interfaces
|October 23, 2024
Summary
Structural isomers of additives can improve defect passivation in hybrid perovskite solar cells (PSCs). Using β-AMECl significantly enhanced photovoltaic performance and long-term stability in PSCs.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Defects in hybrid perovskites limit the efficiency and stability of perovskite solar cells (PSCs).
- Additives are used to passivate these defects, but studies on multifunctional group additives with structural isomers are scarce.
- Understanding the impact of structural variations in additives is crucial for optimizing PSC performance.
Purpose of the Study:
- To investigate the effect of structural isomerism in additives on defect passivation in hybrid perovskites.
- To enhance the photovoltaic performance and long-term stability of PSCs using the structural isomer effect.
- To compare the efficacy of l-Alanine methyl ester hydrochloride (l-AMECl) and its structural isomer, β-AMECl.
Main Methods:
- Synthesis and characterization of l-AMECl and β-AMECl.
- Incorporation of β-AMECl as an additive in the fabrication of hybrid PSCs.
- Evaluation of trap density, photovoltaic parameters (efficiency, voltage, current), and long-term stability of the fabricated PSCs.
Main Results:
- The structural isomer β-AMECl demonstrated superior defect passivation compared to l-AMECl, significantly reducing trap density in the hybrid perovskite.
- PSCs incorporating β-AMECl achieved a power conversion efficiency of 24.25%, a record for PSCs using additives.
- The β-AMECl-based PSCs exhibited excellent long-term stability, retaining 94% of their initial efficiency after 2500 hours under ambient conditions (25 °C, 25% RH).
Conclusions:
- The structural isomer effect plays a critical role in enhancing the defect passivation ability of additives in hybrid perovskites.
- β-AMECl is a highly effective additive for improving both the efficiency and stability of PSCs.
- This study provides a new strategy for designing advanced additives for high-performance and durable perovskite solar cells.
