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Improving FAPbBr3 Perovskite Crystal Quality via Additive Engineering for High Voltage Solar Cell over 1.5 V
Chulhee Yi1, Taemin Kim1, Chanyong Lee1
1Department of Energy Environment Policy and Technology, Graduate School of Energy and Environment (KU-KIST Green School), College of Engineering, Korea University, Seoul 02841, Republic of Korea.
ACS Applied Materials & Interfaces
|July 11, 2024
Summary
Formamidinium lead bromide perovskites show promise for solar cells. Adding formamidinium chloride and urea improves film quality, boosting efficiency and voltage while reducing defects.
Area of Science:
- Materials Science
- Photovoltaics
- Perovskite Solar Cells
Background:
- Lead bromide perovskites are vital for tandem solar cells and high-voltage applications due to wide band gaps and stability.
- Defects in perovskite films limit device performance and efficiency.
- Current methods, like urea addition, can introduce impurities.
Purpose of the Study:
- To enhance the quality of formamidinium lead bromide (FAPbBr3) perovskite films.
- To overcome impurity formation issues associated with urea additives.
- To improve the efficiency and stability of FAPbBr3 single-junction solar cells.
Main Methods:
- Incorporation of formamidinium chloride (FACl) alongside urea into FAPbBr3.
- Analysis of synergistic effects between urea and FACl on film properties.
- Fabrication and characterization of FAPbBr3 single-junction solar cells with additives.
Main Results:
- Synergistic effect of FACl and urea suppressed impurity generation and stabilized film crystallinity.
- Achieved a power conversion efficiency of 9.6% for FAPbBr3 single-junction solar cells.
- Obtained an open-circuit voltage of 1.516 V with negligible hysteresis.
Conclusions:
- Additive engineering with FACl and urea effectively improves FAPbBr3 film quality.
- This approach mitigates energy losses caused by defects in perovskite films.
- The study offers insights for developing high-performance perovskite solar cells.
