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Strong Photocurrent from Two-Dimensional Excitons in Solution-Processed Stacked Perovskite Semiconductor Sheets
Shahab Ahmad1, Pawan K Kanaujia1, Harry J Beeson
1Nanophotonics Laboratory, Department of Physics, Indian Institute of Technology Delhi , New Delhi 110 016, India.
ACS Applied Materials & Interfaces
|October 27, 2015
Summary
Excitons significantly boost photocurrents in 2D perovskite solar cells, even with high binding energies. Enhancements were achieved using transport layers and TiO2 nanoparticles, improving photovoltaic performance.
Area of Science:
- Materials Science
- Solid State Physics
- Photovoltaics
Background:
- Two-dimensional (2D) perovskites are promising photovoltaic materials.
- Understanding exciton behavior in 2D perovskites is crucial for device efficiency.
Purpose of the Study:
- To investigate the role of excitons in room-temperature photocurrent generation in 2D perovskite devices.
- To explore methods for enhancing photocurrent extraction in these materials.
Main Methods:
- Room-temperature photocurrent measurements were performed on 2D inorganic-organic perovskite devices.
- Devices were fabricated with varying architectures, including metallic Schottky contacts, electron- and hole-transport layers, and integrated TiO2 nanoparticles.
Main Results:
- Excitons were found to strongly contribute to photocurrents despite high binding energies.
- Incorporating transport layers enhanced photocurrents by 100-fold.
- Direct integration of TiO2 nanoparticles further increased photocurrents by 10-fold without disrupting the 2D structure.
Conclusions:
- Strongly excitonic materials can be viable for photovoltaic applications, even with high exciton binding energies.
- Device engineering, including transport layers and nanoparticle integration, significantly improves photocurrent extraction in 2D perovskites.
- These findings offer insights into the photovoltaic properties of both 2D and related 3D perovskites.
