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Defects in RbF - Treated Cu(InxGal-x)Se2 Solar Cells and Their Impact on Voc

Conference ·
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Cu(In,Ga)Se2 solar cell efficiency is limited by VOC due in large part to bulk defects limiting lifetime, but alkali treatments such as RbF recover some of the VOC loss. In this work, defects in RbF-treated and untreated CIGS were quantitatively characterized using DLTS and DLOS, and three main defects were identified in each sample. The RbF-PDT resulted in a large decrease in the mid-gap trap concentration, which was accompanied by a large improvement in minority carrier lifetime. This lifetime improvement combined with a change in doping accounted for a significant portion of the VOC improvement in the RbF CIGS.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
DOE Contract Number:
AC36-08GO28308
OSTI ID:
2309707
Report Number(s):
NREL/CP-5900-88879; MainId:89658; UUID:90bf57b0-9125-40ef-bf14-3bd05691920f; MainAdminId:71874
Resource Relation:
Conference: Presented at the 2023 IEEE 50th Photovoltaic Specialists Conference (PVSC), 11-16 June 2023, San Juan, Puerto Rico
Country of Publication:
United States
Language:
English

References (10)

Large‐Area (Ag,Cu)(In,Ga)Se 2 Thin‐Film Solar Cells with Increased Bandgap and Reduced Voltage Losses Realized with Bulk Defect Reduction and Front‐Grading of the Absorber Bandgap May 2022
Analysis of Recombination Mechanisms in RbF-Treated CIGS Solar Cells January 2019
Diffusion of Alkali Metals in Polycrystalline CuInSe 2 and Their Role in the Passivation of Grain Boundaries March 2019
Impact of RbF-PDT on Cu(In,Ga)Se2 solar cells with CdS and Zn(O,S) buffer layers January 2020
In Situ and Ex Situ Investigations of KF Postdeposition Treatment Effects on CIGS Solar Cells March 2017
Direct nm-Scale Spatial Mapping of Traps in CIGS September 2015
Direct Nanoscale Characterization of Deep Levels in AgCuInGaSe 2 Using Electron Energy‐Loss Spectroscopy in the Scanning Transmission Electron Microscope August 2019
On the photoionization of deep impurity centers in semiconductors September 1965
Light- and bias-induced metastabilities in Cu(In,Ga)Se[sub 2] based solar cells caused by the (V[sub Se]-V[sub Cu]) vacancy complex January 2006
Role of Ev+0.98 Ev trap in light soaking-induced short circuit current instability in CIGS solar cells June 2017

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Related Subjects

SOLAR ENERGY
charge carrier lifetime
doping
integrated circuit modeling
limiting
photovoltaic cells
photovoltaic systems
semiconductor process modeling