Electron Beam-Induced Current (EBIC) in solution-processed solar cells.

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Solar cell performance relies heavily on material homogeneity.
• Assessing homogeneity in novel solar cell architectures, like solution-processed types, is critical for development.
• Electron Beam-Induced Current (EBIC) is a powerful technique for probing semiconductor properties.

Purpose of the Study:

• To investigate the homogeneity of solution-processed solar cells using Electron Beam-Induced Current (EBIC) measurements.
• To generate 2D homogeneity maps for both inorganic and organic active layer solar cells.
• To establish a reliable method for characterizing these solar cells prior to potential material degradation.

Main Methods:

• Utilized scanning electron microscopy (SEM) with a focused electron beam.
• Employed a programmable sample stage for precise solar cell positioning under the electron beam.
• Acquired 2D Electron Beam-Induced Current (EBIC) maps by measuring the induced current as the beam scanned across the sample.

Main Results:

• Successfully generated 2D EBIC maps demonstrating the spatial homogeneity of the active layers in solution-processed solar cells.
• Identified variations in current generation across the solar cell surface, indicative of homogeneity.
• Confirmed the applicability of EBIC for characterizing both inorganic and organic solar cell materials.

Conclusions:

• 2D EBIC mapping is an effective method for evaluating the homogeneity of solution-processed solar cells.
• Careful execution of EBIC measurements is necessary to avoid irreversible damage to organic semiconductor materials.
• This technique provides valuable insights for optimizing the fabrication and performance of next-generation solar cells.