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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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Slow Passivation and Inverted Hysteresis for Hybrid Tin Perovskite Solar Cells Attaining 13.5% via Sequential
Efat Jokar1,2, He-Shiang Chuang1, Chun-Hsiao Kuan1
1Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan.
The Journal of Physical Chemistry Letters
|October 11, 2021
Summary
Surface passivation of hybrid perovskite solar cells using phenylhydrazinium thiocyanate (PHSCN) significantly enhances performance and stability. This method improves photoluminescence lifetime and charge extraction, leading to higher efficiencies and reduced hysteresis.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Chemistry
Background:
- Hybrid mixed cationic tin perovskites are promising photovoltaic materials.
- Surface defects in perovskites limit device performance and stability.
- Effective passivation strategies are crucial for advancing perovskite solar cell technology.
Purpose of the Study:
- To develop a sequential deposition procedure for surface passivation of hybrid mixed cationic tin perovskite (E1G20).
- To investigate the impact of phenylhydrazinium thiocyanate (PHSCN) passivation on perovskite film properties and device performance.
- To elucidate the mechanism behind the observed passivation effects and device behavior.
Main Methods:
- Sequential deposition of phenylhydrazinium thiocyanate (PHSCN) onto E1G20 perovskite films.
- Photoluminescence lifetime measurements to assess passivation quality.
- Charge extraction rate analysis using C60 layer.
- Current-voltage (I-V) characterization of fabricated devices.
- Long-term shelf-life stability testing.
Main Results:
- PHSCN passivation enhanced photoluminescence lifetime by a factor of 6.
- Charge-extraction rate from perovskite to C60 improved by a factor of 2.5.
- Device efficiency increased to 13.5% after a storage period, with forward scan efficiency exceeding reverse scan (inverted hysteresis).
- The passivated device demonstrated stability over 3000 hours of shelf storage in a glovebox.
Conclusions:
- Sequential deposition of PHSCN is an effective method for passivating hybrid mixed cationic tin perovskite surfaces.
- PHSCN passivation improves optoelectronic properties, leading to enhanced device efficiency and stability.
- An ion-migration model is proposed to explain the observed phenomena, including inverted hysteresis, attributed to phenylhydrazinium surface passivation.
