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Published on: March 19, 2017
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Regulating 3D Phase in Quasi-2D Perovskite Films for High-Performance and Stable Photodetectors
Haipeng Di1, Wen Zeng2,3, Bo-Han Li2
1Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China.
Summary
Carbohydrazide additive improves charge transport in quasi-2D perovskites by enhancing the 3D phase. This boosts device performance and enhances stability, paving the way for advanced perovskite applications.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Quasi-2D perovskites offer excellent stability and optoelectronic properties but suffer from limited charge transport.
- Efficient charge transport is crucial for realizing the full potential of perovskite-based devices.
Purpose of the Study:
- To enhance charge transport in quasi-2D perovskites by regulating the 3D perovskite phase.
- To improve the performance and stability of perovskite optoelectronic devices.
Main Methods:
- Introducing carbohydrazide (CBH) as an additive into (PEA)2MA3Pb4I13 precursors.
- Controlling crystallization process to improve the phase ratio and crystal quality of the 3D phase.
Main Results:
- Significant improvement in charge transport and extraction efficiency.
- Device achieved nearly 100% internal quantum efficiency, responsivity of 0.41 A/W, and detectivity of 1.31 × 10^12 Jones at 570 nm.
- Enhanced air and moisture stability of the perovskite films due to improved crystal quality and defect passivation.
Conclusions:
- Carbohydrazide additive effectively regulates the 3D phase in quasi-2D perovskites, boosting charge transport.
- The strategy enhances device performance and stability, offering a pathway for future perovskite applications.
- This work provides insights into improving perovskite stability through passivation and additives.
