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A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals
Published on: May 10, 2018
Deep level transient spectroscopy (DLTS) on colloidal-synthesized nanocrystal solids
Deniz Bozyigit1, Michael Jakob, Olesya Yarema
1Laboratory for Nanoelectronics, Department of Information Technology and Electrical Engineering, Eidgenoessische Technische Hochschule Zurich.
ACS Applied Materials & Interfaces
|March 27, 2013
Summary
We used current-based deep level transient spectroscopy (DLTS) to quantify deep trap states in lead sulfide (PbS) nanocrystal solids. This electrical measurement reveals trap properties crucial for understanding charge transport and optoelectronic device performance.
Area of Science:
- Materials Science
- Solid-State Physics
- Nanotechnology
Background:
- Deep-lying trap states significantly influence charge transport in semiconductor nanocrystal solids.
- These trap states critically impact the performance of optoelectronic devices, such as solar cells.
- Understanding trap characteristics is essential for advancing nanocrystal-based electronics.
Purpose of the Study:
- To quantitatively characterize deep-lying trap states in semiconductor nanocrystal solids using an electrical measurement.
- To investigate the role of trap states in the electronic transport properties of novel nanocrystal materials.
- To gain insights into the operation of lead sulfide (PbS) nanocrystal-based solar cells.
Main Methods:
- Demonstration of current-based deep level transient spectroscopy (DLTS) on semiconductor nanocrystal solids.
- Application of DLTS to an ethanedithiol-treated PbS nanocrystal solid.
- Electrical characterization to obtain trap activation energy and density.
Main Results:
- Successfully obtained quantitative information on deep-lying trap states.
- Identified a deep trap in PbS nanocrystal solids with an activation energy of 0.40 eV.
- Determined the trap density to be NT = 1.7 × 10(17) cm(-3).
Conclusions:
- The study provides crucial data on trap states in PbS nanocrystal solids.
- Findings enable the development of accurate band structure models for charge transport analysis.
- Results contribute to the optimization of PbS nanocrystal-based solar cell performance.
