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Published on: September 8, 2017
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Towards low-temperature processing of efficient γ-CsPbI3 perovskite solar cells
Zongbao Zhang1,2, Ran Ji1,2, Yvonne J Hofstetter1,2
1Chair for Emerging Electronic Technologies, Technische Universität Dresden Nöthnitzer Straße 61 01187 Dresden Germany yana.vaynzof@tu-dresden.de.
Journal of Materials Chemistry. A
|November 28, 2023
Summary
Researchers developed a low-temperature method for stable inorganic cesium lead iodide perovskite solar cells (PSCs). Introducing ethane-1,2-diammonium iodide (EDAI2) and regulating lead acetate improved efficiency and stability in these advanced photovoltaic devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inorganic cesium lead iodide (CsPbI3) perovskite solar cells (PSCs) offer excellent thermal stability and a suitable bandgap for tandem applications.
- Low-temperature fabrication of high-performance CsPbI3 PSCs remains a significant challenge.
Purpose of the Study:
- To develop a novel, low-temperature fabrication method for high-efficiency and stable gamma-CsPbI3 PSCs.
- To investigate the roles of ethane-1,2-diammonium iodide (EDAI2) and lead acetate (Pb(OAc)2) in promoting gamma-CsPbI3 formation and stabilization.
Main Methods:
- Fabrication of CsPbI3 PSCs using a new method involving EDAI2 and controlled Pb(OAc)2 content in the precursor solution.
- Optimization of the hole transport layer in CsPbI3 inverted architecture solar cells.
- Assessment of device efficiency and long-term stability under ambient conditions.
Main Results:
- The new method successfully promoted the formation and stabilization of the desired gamma-CsPbI3 phase at lower temperatures.
- Improved film crystallinity, morphology, and reduced carrier recombination were observed.
- Optimized inverted PSCs achieved a power conversion efficiency of up to 16.6%.
- Encapsulated devices retained 97% of their initial efficiency after 25 days under room temperature and dim light conditions.
Conclusions:
- The synergistic effect of EDAI2 and Pb(OAc)2 enables efficient and stable low-temperature fabrication of gamma-CsPbI3 PSCs.
- This approach overcomes previous limitations in CsPbI3 PSC performance and stability.
- The findings pave the way for practical applications of stable, high-performance CsPbI3-based solar cells.
