skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Three-dimensional minority carrier lifetime mapping of thin film semiconductors for solar cell applications

Abstract

This project addresses the difficulty of accurately measuring charge carrier dynamics in novel semiconductor materials for thin film photovoltaic cells. We have developed a two- photon lifetime tomography technique to separate bulk minority carrier lifetime from surface recombination effects and effects of recombination at sub-surface defects. This technique also enables us to characterize how local defects such as grain boundaries– buried below the surface of a sample–affect carrier lifetimes in the active layer, dynamics that have been previously inaccessible. We have applied this newly developed technique to illuminate how CdCl 2 treatment improves CdTe PV efficiency. From striking 3D lifetime tomography maps, a clear, sub- surface understanding emerges of the photophysical changes that occur in CdTe active medium following exposure to CdCl 2, a standard step in the fabrication of high-efficiency CdTe-based solar cells. This work demonstrates a well-defined method to quantify grain-boundary, interface, and bulk recombination in CdTe and other optically-active polycrystalline semiconductor materials; information that can provide critical information to the development of next- generation photovoltaics and many other semiconductor technologies.

Authors:
 [1];  [1];  [1]
  1. PLANT PV, Inc., Belmont, CA (United States)
Publication Date:
Research Org.:
PLANT PV, Inc., Belmont, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411710
Report Number(s):
DE-EE-0005953
DOE Contract Number:  
EE0005953
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Hardin, Brian, Peters, Craig, and Barnard, Edward. Three-dimensional minority carrier lifetime mapping of thin film semiconductors for solar cell applications. United States: N. p., 2015. Web. doi:10.2172/1411710.
Hardin, Brian, Peters, Craig, & Barnard, Edward. Three-dimensional minority carrier lifetime mapping of thin film semiconductors for solar cell applications. United States. doi:10.2172/1411710.
Hardin, Brian, Peters, Craig, and Barnard, Edward. Wed . "Three-dimensional minority carrier lifetime mapping of thin film semiconductors for solar cell applications". United States. doi:10.2172/1411710. https://www.osti.gov/servlets/purl/1411710.
@article{osti_1411710,
title = {Three-dimensional minority carrier lifetime mapping of thin film semiconductors for solar cell applications},
author = {Hardin, Brian and Peters, Craig and Barnard, Edward},
abstractNote = {This project addresses the difficulty of accurately measuring charge carrier dynamics in novel semiconductor materials for thin film photovoltaic cells. We have developed a two- photon lifetime tomography technique to separate bulk minority carrier lifetime from surface recombination effects and effects of recombination at sub-surface defects. This technique also enables us to characterize how local defects such as grain boundaries– buried below the surface of a sample–affect carrier lifetimes in the active layer, dynamics that have been previously inaccessible. We have applied this newly developed technique to illuminate how CdCl2 treatment improves CdTe PV efficiency. From striking 3D lifetime tomography maps, a clear, sub- surface understanding emerges of the photophysical changes that occur in CdTe active medium following exposure to CdCl2, a standard step in the fabrication of high-efficiency CdTe-based solar cells. This work demonstrates a well-defined method to quantify grain-boundary, interface, and bulk recombination in CdTe and other optically-active polycrystalline semiconductor materials; information that can provide critical information to the development of next- generation photovoltaics and many other semiconductor technologies.},
doi = {10.2172/1411710},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {9}
}