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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
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Perovskite photovoltaics featuring solution-processable TiO2 as an interfacial electron-transporting layer display to
Yang-Yen Yu1, Rih-Sheng Chiang, Hsiang-Lin Hsu
1Department of Materials Engineering, Ming Chi University of Technology, 84 Gunjuan Road, Taishan, New Taipei City, 243, Taiwan. yyyu@mail.mcut.edu.tw cpchen@mail.mcut.edu.tw.
Nanoscale
|August 23, 2014
Summary
Adding titanium dioxide (TiO2) nanoparticles to perovskite photovoltaic devices significantly boosts power conversion efficiency (PCE) and enhances operational stability. This modification improves electron transport and barrier properties, leading to more robust solar cell performance.
Area of Science:
- Materials Science
- Energy Science
- Nanotechnology
Background:
- Planar heterojunction perovskite photovoltaic (PPV) devices based on CH3NH3PbI3/PCBM are promising for solar energy conversion.
- Optimizing interfacial layers is crucial for improving the performance and stability of PPV devices.
- Indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) (PEDOT) substrates are commonly used in PPV device fabrication.
Purpose of the Study:
- To investigate the effect of solution-processable crystalline titanium dioxide (TiO2) nanoparticles as an interfacial layer in CH3NH3PbI3/PCBM-based PPV devices.
- To enhance the power conversion efficiency (PCE) and operational stability of PPV devices.
- To understand the role of the TiO2 layer in improving electron transport and barrier properties.
Main Methods:
- Fabrication of PPV devices with and without a TiO2 interfacial layer between the active layer and aluminum cathode.
- Optimization of the preheating temperature of the ITO/PEDOT substrate for devices without TiO2.
- Characterization of device performance, including PCE under simulated AM 1.5 G irradiation.
- Assessment of device stability under long-term storage in a dark N2-filled glove box and under ambient conditions (ISOS-D-1).
Main Results:
- Optimized PPV devices without TiO2 achieved a PCE of 6.3%.
- Incorporation of the TiO2 layer significantly increased the PCE to 7.0%.
- The TiO2-containing PPV devices demonstrated excellent stability, retaining ~96% of their PCE after 1000 h in a glove box.
- Unencapsulated TiO2-containing devices retained 80% of their initial efficiency (T80) after 1 week under ambient conditions, compared to only 3 h for normal devices.
Conclusions:
- Solution-processable crystalline TiO2 nanoparticles effectively function as an interfacial layer in PPV devices.
- The TiO2 layer enhances electron transporting, hole blocking, and barrier properties, leading to improved device performance and stability.
- TiO2 incorporation offers a viable strategy for developing highly stable and efficient perovskite photovoltaic devices.
