Chuanxiao Xiao

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Lead thiocyanate in the perovskite precursor can increase the grain size of a perovskite thin film and reduce the conductivity of the grain boundaries, leading to perovskite solar cells with reduced hysteresis and enhanced fill factor. A planar perovskite solar cell with grain boundary and interface passivation achieves a steady-state efficiency of 18.42%.
We successfully applied scanning capacitance spectroscopy (SCS) on CIGS solar cells. In SCS, a high-quality insulating layer is needed to block the AC and DC conductance between the probe and sample. A sample preparation procedure was developed on CIGS/CdS cross-sectional samples for optimal and reproducible results. Spectra taken with 10-nm intervals(More)
A key pathway to meeting the Department of Energy SunShot 2020 goals is to reduce financing costs by improving investor confidence through improved photovoltaic (PV) module reliability. A comprehensive approach to further understand and improve PV reliability includes characterization techniques and modeling from module to atomic scale. Imaging techniques,(More)
We report on the fabrication and characterization of polycrystalline Cu<sub>3</sub>SbS<sub>4</sub> thin films grown by magnetron sputtering. We find that Cu<sub>3</sub>SbS<sub>4</sub> thin films deposited at various temperatures show the Famatinite structure and high optical absorptions with band gaps of slightly lower than 1.0 eV and weak absorptions(More)
We have fabricated CdTe solar cells on commercial SnO<sub>2</sub>/SnO<sub>2</sub>:F coated soda-lime glass substrates using ZnS/CdS window layers with various thickness combinations. With our standard fabrication method, CdTe solar cells with ZnS/CdS window layers have exhibited efficiencies as high as 12.3% under AM1.5 illumination. However, the(More)
Deep defect states of Cadmium Telluride deposited via close space sublimation and magnetron sputtering are evaluated via steady state and time resolved photoluminescence. Intensity dependent photoluminescence measurements for as-grown and cadmium chloride treated samples reveal the recombination mechanism associated with each transition. The as-grown(More)
Thin films of CdS and CdS:O were deposited using RF magnetron sputtering at room temperature and at 270 &#x00B0;C in sputtering ambient with 0-4% O<sub>2</sub> (balance Ar). These films were characterized with respect to their optical and structural properties. The samples were then subjected to a heat treatment similar to that experienced during CdTe(More)
The development of high-efficiency CdS/CdTe thin-film solar cells with Cu-free back contacts is an important and challenging issue. In this study, we report on the performance of CdS/CdTe thin-film solar cells with Cu-free MoO<sub>3-x</sub>/Au back contacts and standard Cu/Au back contacts. All cells were fabricated on SnO<sub>2</sub>:F-coated soda-lime(More)
We report ou characterization of SnS thin films grown by high temperature close space sublimation (CSS) method. The CSS grown films are slightly Sn-rich and show high degree of crystalmity with orthorhombic (Herzeubergite) crystal structure. The as deposited SnS has direct transition at about 1.3 eV with a very high absorption (&#x03B1; ~10<sup>4</sup>(More)
We located the electrical junction (EJ) of Cu(In, Ga)Se<sub>2</sub> (CIGS) and Cu<sub>2</sub>ZnSnSe<sub>4</sub> (CZTS) solar cells with ~20-nm accuracy using a scanning capacitance spectroscopy (SCS) technique. A procedure was developed to prepare the cross-sectional samples and grow critical high-quality insulating layers for the SCS measurement. We found(More)