Synergetic Interface and Bulk Defects Modification with Identical Organic Molecule for Efficient Inverted Perovskite
Junbo Yang1, Zhu Ma1,2, Wei You1
1School of New Energy and Materials, Southwest Petroleum University (SWPU), Chengdu 610500, China.
ACS Applied Materials & Interfaces
|January 15, 2025
Summary
This study introduces a dual modification strategy using 4-amino-3,5-dichlorobenzotrifluoride (DCTM) for high-performance inverted perovskite solar cells (IPSCs). DCTM enhances both NiO interface properties and perovskite bulk quality, boosting efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Recent advancements in inverted perovskite solar cells (IPSCs) primarily target NiO modification and perovskite (PVK) regulation for improved efficiency and stability.
- Existing research often employs monofunctional modifications, with limited exploration of single molecules capable of simultaneously optimizing both the NiO interface and the perovskite bulk phase.
Purpose of the Study:
- To introduce a novel dual modification approach using 4-amino-3,5-dichlorobenzotrifluoride (DCTM) to enhance both the NiO upper interfaces and reduce bulk defects in perovskite.
- To investigate the impact of DCTM on NiO conductivity, energy alignment, perovskite grain orientation, and carrier dynamics.
Main Methods:
- Utilized 4-amino-3,5-dichlorobenzotrifluoride (DCTM) for dual modification of NiO and perovskite layers.
- Employed techniques including femtosecond transient absorption (TA) spectroscopy to analyze carrier transport dynamics.
- Fabricated and characterized optimized inverted perovskite solar cells (IPSCs).
Main Results:
- DCTM treatment optimized NiO conductivity and energy level alignment with the electron transport layer.
- Perovskite films modified with DCTM showed reduced bulk defects, improved vertical grain orientation, and suppressed nonradiative recombination, leading to enhanced carrier lifetime.
- Optimized IPSCs achieved a peak power conversion efficiency (PCE) of 22.8% with minimal hysteresis (0.7%).
- Unencapsulated devices retained over 80% of their initial PCE after 1000 hours of storage in ambient air (30% relative humidity).
Conclusions:
- The monomolecular dual modification strategy using DCTM offers a simple yet effective solution for interface optimization in IPSCs.
- This approach provides valuable insights into selecting aniline-derived molecules for developing high-performance and stable perovskite solar cells.
