(Cd,Zn,Mg)Te-based microcavity on MgTe sacrificial buffer: Growth, lift-off, and transmission studies of polaritons

Seredyński, Bartłomiej; Król, Mateusz; Starzyk, P.; Mirek, Rafał; Ściesiek, Maciej; Sobczak, Kamil; Borysiuk, J.; Stephan, D.; Rousset, J.-G.; Szczytko, Jacek; Piętka, B.; Pacuski, W.

doi:10.1103/physrevmaterials.2.043406

Cited by 9 publications

(2 citation statements)

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“…Plan-view cleave techniques developed decades ago for epitaxially grown single crystals were primarily viewed as a means of re-using expensive growth substrates. [37][38][39] The sacrificial etch approach, also called "epitaxial lift-off" (ELO) for single crystals, [30,37,38,[40][41][42] involves the deposition of a sacrificial layer (e.g., AlAs) between the growth substrate and film stack, which is then preferentially etched to release the stack. While this technique can generate devices with particularly high power densities, [43] exceedingly slow etch rates, use of chemically reactive etchants (e.g., HF), and required changes to growth (i.e., additional steps, reoptimization of layers) make this approach nonideal.…”

Section: Background On Delamination Techniquesmentioning

confidence: 99%

Thermomechanical Cleave of Polycrystalline CdTe Solar Cells and its Applications: A Review

2023

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One of the primary research challenges for cadmium telluride (CdTe) solar cells is addressing its open‐circuit voltage (VOC) deficit. While theoretical studies and single crystal work show VOC > 1 V is possible, devices remain stubbornly low at ≈800–900 mV. As absorber opto‐electronic properties (e.g., hole density, carrier lifetime) are improved, device modeling suggests that interfaces become limiting. Because CdTe‐based devices are typically grown in the superstrate configuration, the back interface is relatively accessible for manipulation and study, while the front interface (i.e., the heterojunction region) is buried under microns of material and inaccessible. NREL has developed a novel technique to thermomechanically cleave polycrystalline CdTe device stacks directly at the front interface, enabling characterization and controlled manipulation of this important region. Herein, recent work, primarily from NREL, will be reviewed, including considerations for achieving successful delamination; key scientific discoveries about the front interface that have been enabled by this technique; and practical applications, such as flexible, low‐cost solar with high power‐to‐weight ratio.

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Section: Background On Delamination Techniquesmentioning

confidence: 99%

Thermomechanical Cleave of Polycrystalline CdTe Solar Cells and its Applications: A Review

2023

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“…Lift-off is an attractive approach to fabricate flexible CdTe solar cells due to its low-cost fabrication process. Currently, a variety of lift-off methods have been developed to fabricate flexible CdTe solar cells, including scarification layer-assisted lift-off, ,, mechanical lift-off, , thermomechanical stress, − and water-assisted lift-off. − Water-assisted lift-off to fabricate flexible CdTe solar cells is a technique that was recently reported by Wen and co-workers through lifting epitaxial CdTe films off from a muscovite mica (K 2 O·Al 2 O 3 ·SiO 2 ) substrate. This approach exhibits advantages including less stress in CdTe films and ambient operation temperature.…”

Section: Introductionmentioning

confidence: 99%

Water-Assisted Lift-Off Process for Flexible CdTe Solar Cells

Bista

Rijal

et al. 2023

ACS Appl. Energy Mater.

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In recent years, various lift-off methods have been developed to fabricate lightweight and flexible cadmium telluride (CdTe)-based solar cells. In this work, we report flexible cadmium sulfide (CdS)/CdTe solar cells using a water-assisted lift-off approach. We demonstrate that an additional cadmium chloride treatment for the CdS film is critical to improve the grain size of CdS and the post-deposited CdTe film and the electron conductivity of the CdS film. As a result, the quality of the CdS/CdTe front junction is significantly improved with reduced nonradiative recombination. Finally, our lightweight and flexible polycrystalline CdTe solar cells demonstrate a champion power conversion efficiency of 12.6%.

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