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Published on: February 27, 2017
Reducing Perovskite/C60 Interface Losses via Sequential Interface Engineering for Efficient Perovskite/Silicon Tandem
Zhou Liu1, Hongjiang Li2, Zijing Chu1
1National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, 210023, China.
Interface engineering with ethylenediamine diiodide and 4-Fluoro-Phenethylammonium chloride boosts wide-bandgap perovskite solar cells. This strategy enhances efficiency and open-circuit voltage, paving the way for high-performance perovskite/silicon tandem cells.
Area of Science:
- Materials Science
- Renewable Energy
- Semiconductor Physics
Background:
- Wide-bandgap (WBG) perovskite solar cells are crucial for efficient tandem applications.
- Nonradiative recombination and carrier transport losses at the perovskite/electron-selective contact interface limit device performance.
- Overcoming interface losses is key to reaching the theoretical efficiency limits of WBG perovskite solar cells.
Purpose of the Study:
- To develop a sequential interface engineering (SIE) strategy to mitigate losses at the WBG perovskite/C60 interface.
- To improve the power conversion efficiency (PCE) and open-circuit voltage (Voc) of WBG perovskite solar cells.
- To demonstrate the efficacy of SIE in perovskite/silicon tandem solar cells.
Main Methods:
- Sequential deposition of ethylenediamine diiodide (EDAI2) followed by 4-Fluoro-Phenethylammonium chloride (4F-PEACl) on WBG perovskite films.
- Characterization of the modified perovskite/C60 interface to analyze band alignment and recombination dynamics.
- Fabrication and testing of single-junction WBG perovskite solar cells and monolithic perovskite/silicon tandem solar cells.
Main Results:
- The SIE strategy effectively narrowed the conduction band offset and reduced recombination velocity at the perovskite/C60 interface.
- The optimized WBG perovskite solar cell (1.67 eV) achieved a PCE of 21.8% and a Voc of 1.262 V.
- A monolithic perovskite/silicon tandem solar cell with double-textured silicon demonstrated a stabilized PCE of 29.6% (certified 29.0% at 1 cm2).
Conclusions:
- Sequential interface engineering is a powerful approach to enhance the performance of WBG perovskite solar cells.
- The developed SIE method significantly reduces interface-related losses, enabling higher efficiencies.
- This work highlights the potential of engineered WBG perovskite top cells for high-efficiency perovskite/silicon tandem solar energy conversion.
