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Solar cells. High-efficiency solution-processed perovskite solar cells with millimeter-scale grains
Wanyi Nie1, Hsinhan Tsai2, Reza Asadpour3
1Materials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Science (New York, N.Y.)
|January 31, 2015
Summary
Researchers developed a hot-casting method for growing large-grain organometallic perovskite films. This breakthrough enables high-efficiency, stable solar cells with reduced defects and improved performance.
Area of Science:
- Materials Science
- Renewable Energy
- Semiconductor Physics
Background:
- Advanced photovoltaics rely on high-quality, single-crystalline semiconductors.
- Current methods involve complex, high-temperature crystal growth processes.
- Organometallic perovskites offer potential for efficient solar energy conversion but face challenges like defects and grain boundaries.
Purpose of the Study:
- To develop a scalable, solution-based method for growing large-crystalline perovskite thin films.
- To fabricate and characterize perovskite solar cells using these novel films.
- To address limitations in perovskite film quality, such as defects and grain boundary recombination.
Main Methods:
- A solution-based hot-casting technique was employed to synthesize continuous, pinhole-free organometallic perovskite thin films.
- Millimeter-scale crystalline grains were achieved through controlled film growth.
- Planar solar cells were fabricated using the developed perovskite films for performance evaluation.
Main Results:
- The hot-casting technique successfully produced perovskite films with large crystalline grains.
- Fabricated solar cells demonstrated power conversion efficiencies approaching 18% with minimal variability.
- The devices exhibited a hysteresis-free photovoltaic response, indicating improved operational stability.
- Characterization revealed reduced bulk defects and enhanced charge carrier mobility in large-grain films.
Conclusions:
- The demonstrated hot-casting technique is a promising approach for synthesizing wafer-scale crystalline perovskites.
- This method significantly improves perovskite film quality, leading to high-efficiency and stable solar cells.
- The technique holds potential for application in other solution-processed thin-film materials with similar challenges.
