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Efficient Nanorod Array Perovskite Solar Cells: A Suitable Structure for High Strontium Substitution in Nature
Rui Li1, Huanyu Zhang1, Xing Han1
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
ACS Applied Materials & Interfaces
|February 4, 2020
Summary
Researchers developed lead-less perovskite solar cells (PSCs) using strontium substitution. This approach enhances power conversion efficiency and stability, addressing toxicity concerns for commercial viability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Organic-inorganic hybrid perovskite solar cells (PSCs) show high power conversion efficiency (PCE).
- The presence of toxic lead (Pb) in PSCs hinders commercial application.
- Developing lead-less alternatives is crucial for sustainable solar energy.
Purpose of the Study:
- To fabricate lead-less PSCs using strontium chloride (SrCl2).
- To investigate the effect of strontium (Sr) substitution on perovskite films and cell performance.
- To assess the stability of lead-less PSCs under humidity and thermal stress.
Main Methods:
- Fabrication of PSCs using a TiO2 nanorod array (TNRA) electron transport layer and SrCl2.
- Two-step spin-coating method for perovskite film formation.
- Systematic characterization of film properties and cell performance with varying Sr substitution.
Main Results:
- Sr substitution reduced residual PbI2, improving film quality.
- Optimal PCE of 16.08% achieved with 5 mol % Sr substitution due to enhanced charge extraction and suppressed recombination.
- Sr-substituted PSCs demonstrated improved humidity and thermal stability.
Conclusions:
- Sr substitution is a viable strategy for creating high-performance, lead-less PSCs.
- TNRA structure is suitable for synthesizing stable and efficient Sr-substituted PSCs.
- Lead-less PSCs offer a promising path towards safer and commercially applicable solar technology.
