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Charge Carrier Lifetime Determination in Graded Absorber Solar Cells Using Time‐Resolved Photoluminescence Simulations and Measurements

Journal Article · · Solar RRL

Thin‐film photovoltaic device efficiencies are limited by carrier recombination, thus understanding recombination mechanisms is critical for performance improvements. Bulk minority carrier lifetime ( τ bulk ) is a critical parameter for solar cells but is difficult to determine in P–N junction devices, especially for high doping. As doping ≥10 16  cm −3 is required for efficient drift‐charge‐carrier‐collection devices, a method for τ bulk determination in doped P–N junction devices is necessary. This work utilizes time‐resolved photoluminescence (TRPL) simulations to quantify bulk and interface recombination properties in highly doped, graded absorber CdSeTe structures. The two methods developed here for τ bulk determination include utilization of an instantaneous lifetime representation to guide TRPL fitting and direct comparison between measured and simulated decays. Simulations verified that both methods are valid for state‐of‐the‐art device architectures which include graded bandgap absorbers, graded doping, and graded lifetimes. Shifts in the dominant recombination mechanism are identified for sufficiently long τ bulk , where front and back interface quality plays a more prominent role. Evaluation of surface recombination velocities and conduction band offset illustrate electro‐optical advantages of a positive conduction band offset and highlight the necessity of improved interfaces as bulk quality in photovoltaic devices improves.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
Grant/Contract Number:
AC36-08GO28308; EE0008552
OSTI ID:
1959083
Alternate ID(s):
OSTI ID: 1959085
OSTI ID: 1973679
Report Number(s):
NREL/JA-5900-84670; 2201029
Journal Information:
Solar RRL, Journal Name: Solar RRL Journal Issue: 9 Vol. 7; ISSN 2367-198X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (37)

The role of drift, diffusion, and recombination in time-resolved photoluminescence of CdTe solar cells determined through numerical simulation: The role of drift, diffusion, and recombination in time-resolved photoluminescence journal February 2013
Solar cell efficiency tables (version 57) journal November 2020
Site selective doping of Zn for the p ‐type Cu(In,Ga)Se 2 thin film for solar cell application journal February 2017
CdTe‐Based Solar Cells with Variations in Mg Concentration in the MgZnO Emitter journal April 2021
Review on Alkali Element Doping in Cu(In,Ga)Se 2 Thin Films and Solar Cells journal August 2017
Review of CIGS-based solar cells manufacturing by structural engineering journal September 2020
Investigating the role of copper in arsenic doped Cd(Se,Te) photovoltaics journal October 2022
Effects of absorber near-interface compensation on Cd(Se,Te) solar cell performance journal October 2022
Electro-optical characterization of arsenic-doped CdSeTe and CdTe solar cell absorbers doped in-situ during close space sublimation journal March 2023
Electrical characterization of Cu(In,Ga)Se 2 -solar cells by voltage dependent time-resolved photoluminescence journal May 2015
Study of Arsenic Doped CdSeTe Solar Cells Using Transmission Electron Microscopy journal July 2020
The Role of Back Buffer Layers and Absorber Properties for >25% Efficient CdTe Solar Cells journal July 2019
Revealing the Importance of Front Interface Quality in Highly Doped CdSe x Te 1– x Solar Cells journal November 2021
Efficient organic solar cells processed from hydrocarbon solvents journal January 2016
Understanding the role of selenium in defect passivation for highly efficient selenium-alloyed cadmium telluride solar cells journal May 2019
Exceeding 20% efficiency with in situ group V doping in polycrystalline CdTe solar cells journal August 2019
Understanding what limits the voltage of polycrystalline CdSeTe solar cells journal March 2022
Carrier control in Sn–Pb perovskites via 2D cation engineering for all-perovskite tandem solar cells with improved efficiency and stability journal June 2022
Theoretical study of time-resolved luminescence in semiconductors. III. Trap states in the band gap journal September 2015
Impact of extended defects on recombination in CdTe heterostructures grown by molecular beam epitaxy journal August 2016
The roles of carrier concentration and interface, bulk, and grain-boundary recombination for 25% efficient CdTe solar cells journal June 2017
Identification of the limiting factors for high-temperature GaAs, GaInP, and AlGaInP solar cells from device and carrier lifetime analysis journal December 2017
Recombination velocity less than 100 cm/s at polycrystalline Al 2 O 3 /CdSeTe interfaces journal June 2018
Back-surface recombination, electron reflectors, and paths to 28% efficiency for thin-film photovoltaics: A CdTe case study journal February 2019
Defect-mediated metastability and carrier lifetimes in polycrystalline (Ag,Cu)(In,Ga)Se 2 absorber materials journal June 2020
Mechanisms for long carrier lifetime in Cd(Se)Te double heterostructures journal May 2021
Diverse simulations of time-resolved photoluminescence in thin-film solar cells: A SnO2/CdSeyTe1−y case study journal October 2021
Status and Potential of CdTe Solar-Cell Efficiency journal July 2015
Polycrystalline CdSeTe/CdTe Absorber Cells With 28 mA/cm 2 Short-Circuit Current journal January 2018
Impact of Carrier Concentration and Carrier Lifetime on MgZnO/CdSeTe/CdTe Solar Cells journal November 2020
Effect of Diode Field on Time-Resolved Photoluminescence of CdTe-Based Solar Cells journal March 2022
Impact of interface recombination on time resolved photoluminescence (TRPL) decays in CdTe solar cells (numerical simulation analysis)
  • Kanevce, Ana; Kuciauskas, Darius; Gessert, Timothy A.
  • 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE Photovoltaic Specialists Conference https://doi.org/10.1109/PVSC.2012.6317736
conference June 2012
Optical-fiber-based, time-resolved photoluminescence spectrometer for thin-film absorber characterization and analysis of TRPL data for CdS/CdTe interface conference June 2012
$\text{CdSe}_{\mathrm{x}}\text{Te}_{1-\mathrm{x}}/\text{CdTe}$ Devices with Reduced Interface Recombination Through Novel Back Contacts and Group-V Doping conference June 2020
Microsecond Carrier Lifetimes in Polycrystalline CdSeTe Heterostructures and in CdSeTe Thin Film Solar Cells conference June 2020
Arsenic Doping of Polycrystalline CdSeTe Devices for Microsecond Life-times with High Carrier Concentrations conference June 2020
An empirical analysis of land property lawsuits and rainfalls journal January 2016