Search Results - "Shafarman, William N."

Development of CuInSe2 Nanocrystal and Nanoring Inks for Low-Cost Solar Cells by Guo, Qijie, Kim, Suk Jun, Kar, Mahaprasad, Shafarman, William N, Birkmire, Robert W, Stach, Eric A, Agrawal, Rakesh, Hillhouse, Hugh W

“…The creation of a suitable inorganic colloidal nanocrystal ink for use in a scalable coating process is a key step in the development of low-cost solar cells…”
Get full text

Thin-film solar cells: device measurements and analysis by Hegedus, Steven S., Shafarman, William N.

“…Characterization of amorphous Si, CdTe, and Cu(InGa)Se2‐based thin‐film solar cells is described with focus on the deviations in device behavior from standard…”
Get full text

Ag Alloying and KF Treatment Effects on Low Bandgap CuInSe2 Solar Cells by Valdes, Nicholas H., Lee, JinWoo, Shafarman, William N.

“…Silver alloying and KF post-deposition treatments are explored as approaches to increase the efficiency of low bandgap CuInSe 2 (CIS) solar cells. The KF…”
Get full text

Understanding defect-related issues limiting efficiency of CIGS solar cells by Igalson, Małgorzata, Zabierowski, Paweł, Prządo, Daniel, Urbaniak, Aleksander, Edoff, Marika, Shafarman, William N.

“…Many electrical characteristics of Cu(In,Ga)Se 2-based solar cells, including current–voltage characteristics, are affected by specific properties of…”
Get full text

Ga homogenization by simultaneous H2Se/H2S reaction of Cu-Ga-In precursor by WOO KYOUNG KIM, HANKET, Gregory M, SHAFARMAN, William N

Get full text

Reaction pathway analysis of (AgxCu1−x)(In0.75Ga0.25)Se2 with x = 0.75 and 1.0 by Soltanmohammad, Sina, Shafarman, William N.

“…Reaction pathways during formation of Ag(In0.75Ga0.25)Se2 films were investigated by ex-situ characterization of time-progressive reactions using rapid thermal…”
Get full text

A quaternary Laves-type phase in Ag-Cu-In-Ga thin films by Soltanmohammad, Sina, McCandless, Brian, Shafarman, William N.

“…Formation of a new quaternary Laves-type phase in sputter-deposited and evaporated thin films of Ag-Cu-In-Ga (ACIG) is reported. Films with different…”
Get full text

Thermal and Structural Characterization of Methylammonium‐ and Formamidinium‐Halide Salts by Harding, Alexander J., Dobson, Kevin D., Ogunnaike, Babatunde A., Shafarman, William N.

“…Four organic halide salts of interest to alloyed perovskite solar cell fabrication are characterized using attenuated total reflectance Fourier transform…”
Get full text

Surface sulfurization studies of Cu(InGa)Se2 thin film by SINGH, Udai P, SHAFARMAN, William N, BIRKMIRE, Robert W

“…Sulfurization of copper indium gallium diselenide (CIGS) thin films solar cell absorber has been used to enhance the open-circuit voltage of the device by…”
Get full text

Composition and bandgap control in Cu(In,Ga)Se2‐based absorbers formed by reaction of metal precursors by Kim, Kihwan, Park, Hyeonwook, Hanket, Gregory M., Kim, Woo Kyoung, Shafarman, William N.

“…The control of composition and bandgap in chalcopyrite thin‐film absorber layers formed by a metal precursor reaction is addressed. Two processes using…”
Get full text

The Role of Oxygen Exposure on the Performance of All-Vapor-Processed Perovskite Solar Cells With CuPC Hole Transport Layers by Kuba, Austin G., Du, Bin, Harding, Alexander J., Dobson, Kevin D., McCandless, Brian E., Das, Ujjwal K., Shafarman, William N.

“…Methylammonium lead iodide (MAPbI 3 ) perovskite solar cells were made using an all-vapor process, including two-step close space vapor transport-processed…”
Get full text

Influence of Ga and Ag on the KF Treatment Chemistry for CIGS Solar Cells by Valdes, Nicholas H., Jones, Kevin J., Opila, Robert L., Shafarman, William N.

“…The KF postdeposition treatment (KF-PDT) is compared on Cu(In,Ga)Se 2 (CIGS) and CuInSe 2 (CIS), as well as Ag alloyed CIGS and CIS (ACIGS and ACIS), with the…”
Get full text

Reaction Rate Enhancement for Cu(In,Ga)Se2 Absorber Materials Using Ag-Alloying by Soltanmohammad, Sina, Tong, Ho Ming, Anderson, Timothy J., Shafarman, William N.

“…The addition of Ag to Cu-Ga-In precursors for synthesizing (Ag,Cu)(In,Ga)Se 2 (ACIGS) thin films has shown benefits including improved adhesion, greater…”
Get full text

The growth of methylammonium lead iodide perovskites by close space vapor transport by Harding, Alexander J, Kuba, Austin G, McCandless, Brian E, Das, Ujjwal K, Dobson, Kevin D, Ogunnaike, Babatunde A, Shafarman, William N

“…Vapor deposition processes have shown promise for high-quality perovskite solar cells with potential pathways for scale-up to large area manufacturing. Here,…”
Get full text

Precursor Reaction Method With High Ga Cu(In,Ga)(S,Se) to Achieve Increased Open-Circuit Voltage by Lam, Isaac K., Hanket, Gregory M., Shafarman, William N.

“…The precursor reaction process for the fabrication of Cu(In,Ga)Se<inline-formula><tex-math notation="LaTeX">_{2}</tex-math></inline-formula> solar cells…”
Get full text

An improved method for determining carrier densities via drive level capacitance profiling by Warren, Charles W., Roe, Ellis T., Miller, D. Westley, Shafarman, William N., Lonergan, Mark C.

“…We demonstrate that an analytic relationship between coefficients in the Taylor expansion of the junction capacitance can be exploited to yield more precise…”
Get full text

Methylamine Post-Deposition Treatments of Vapor-Deposited Perovskite Thin Films by Santiwipharat, Chaiwarut, Kuba, Austin G., Dobson, Kevin D., Das, Ujjwal K., Shafarman, William N.

“…While the development of methylammonium lead iodide (MAPbI 3 ) perovskite for photovoltaics has grown rapidly, the growth of high-quality material from vapor…”
Get full text

Ag–Cu–In–Ga Metal Precursor Thin Films for (Ag,Cu)(In,Ga)Se2 Solar Cells by Soltanmohammad, Sina, Lei Chen, McCandless, Brian, Shafarman, William N.

“…The Ag-Cu-In-Ga (ACIG) material system has been investigated over a composition range used for reaction to form (Ag,Cu)(In,Ga)Se 2 thin films for photovoltaic…”
Get full text

Microstructure and phase evolution in single phase CuInSe2 particles synthesized using elemental precursors by Yassitepe, Emre, Shafarman, William N., Shah, S. Ismat

“…This paper reports solid-state formation reaction pathways for CuInSe2 particles synthesized by ultrasonic irradiation of elemental precursors followed by…”
Get full text

Peculiar bond length dependence in (Ag,Cu)GaSe2 alloys and its impact on the bandgap bowing by Falk, Hans H., Eckner, Stefanie, Seifert, Michael, Ritter, Konrad, Levcenko, Sergiu, Pfeiffelmann, Timo, Welter, Edmund, Botti, Silvana, Shafarman, William N., Schnohr, Claudia S.

“…Contrary to other semiconductor alloys, incorporation of Ag into CuGaSe2 increases the bandgap, even though the lattice expands, and the Ga–Se bond length is…”
Get full text