More Like this

1. MOCVD Deposition of Group V Doped CdTe in Sublimated CdTe and CdSeTe Devices

   https://doi.org/10.1109/PVSC.2018.8547722  

   Danielson, Adam; Munshi, Amit; Swanson, Drew; Drayton, Jennifer; Kartopu, Giray; Barth, Kurt; Irvine, Stuart; Sampath, Walajabad (June 2018, 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC))
2. Heteroconfinement in Single CdTe Nanoplatelets

   https://doi.org/10.1021/acsnano.4c17596  

   Ahmed, Tasnim; Tan, Xuanheng; Li, Barry Y; Cook, Elijah; Williams, Jillian; Tiano, Sophia M; Coffey, Belle; Tenney, Stephanie M; Hayes, Dugan; Caram, Justin R (January 2025, ACS Nano)

   Dimension-engineered synthesis of atomically thin II–VI nanoplatelets (NPLs) remains an open challenge. While CdSe NPLs have been made with confinement ranging from 2 to 11 monolayers (ML), CdTe NPLs have been significantly more challenging to synthesize and separate. Here we provide detailed mechanistic insight into the layer-by-layer growth kinetics of the CdTe NPLs. Combining ensemble and single-particle spectroscopic and microscopic tools, our work suggests that beyond 2 ML CdTe NPLs, higher ML structures initially appear as heteroconfined materials with colocalized multilayer structures. In particular, we observe strongly colocalized 3 and 4 ML emissions, accompanied by a broad trap emission. Accompanying transient absorption, single-particle optical, and atomic force microscopy analyses suggest islands of different MLs on the same NPL. To explain the nonstandard nucleation and growth of these heteroconfined structures, we simulated the growth conditions of NPLs and quantified how the monomer binding energy modifies the kinetics and permits single NPLs with multi-ML structures. Our findings suggest that the lower bond energy associated with CdTe relative to CdSe limits higher ML syntheses and explains the observed differences between CdTe and CdSe growth. 

   more » « less
3. Atomistic modeling of energy band alignment in CdTe(1 0 0) and CdTe(1 1 1) surfaces

   https://doi.org/10.1016/j.apsusc.2020.146832  

   Nicholson, Anthony P.; Martinez, Umberto; Shah, Akash; Thiyagarajan, Aanand; Sampath, Walajabad S. (October 2020, Applied Surface Science)
4. Doping CdTe Absorber Cells using Group V Elements

   https://doi.org/10.1109/PVSC.2018.8547792  

   Danielson, Adam; Munshi, Amit; Kindvall, Anna; Swain, Santosh Kumar; Barth, Kurt; Lynn, Kelvin; Sampath, Walajabad (June 2018, 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC))
5. Glancing Angle Deposited CdTe: Optical Properties and Structure

   https://doi.org/10.1109/PVSC.2018.8547890  

   Adhikari, Dipendra; Koirala, Prakash; Junda, Maxwell M.; Collins, Robert W.; Podraza, Nikolas J. (June 2018, 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC))

   Optical and microstructural properties of as-deposited CdTe films deposited on soda lime glass by magnetron sputtering at various source flux angles have been investigated using GIXRD, SEM, unpolarized transmittance / reflectance, and spectroscopic ellipsometry. Influence of deposition angle on resultant crystalline grain size and orientation are tracked for these films. All CdTe films studied are found to have cubic crystal structure and (111) preferential grain orientation. Films deposited at 0° and 45° are almost entirely (111) oriented, whereas films deposited at higher angles exhibit a wider variety of competing grain orientations, suggesting that deposition angle can be used as an effective parameter towards controlling grain orientation. With increasing numbers of grain orientations, grain size is found to decrease. Ex-situ spectroscopic ellipsometry is used to obtain the structural and optical properties. Stress induced in the film is calculated based on shifts of critical point energies. 

   more » « less