A new chemical route to Cu2ZnSn(SxSe1‐x)4 based thin film solar cells has been developed using spin coating of commercially available molecular precursors from an environmentally friendly non‐toxic solvent. 4.1% efficiency solar cells were achieved after selenization of Cu2ZnSnS4. This technique could provide simple, facile, and reproducible fabrication for efficient and large area solar cells.

A unique type of inorganic-organic hybrid semiconductor bulk material is capable of emitting direct white light. Their photoluminescence properties can be tuned precisely and systematically by modifying structures and composition. They could be used as a single-material light-emitting source in high efficiency white-light-emitting diodes.

A unique family of II−VI based nanostructured inorganic−organic hybrid semiconductors exhibit nearly zero uniaxial thermal expansion in the temperature range of 95−295 K. Both their optoelectronic and thermal expansion properties are systematically tunable. The diamine molecules show a strong negative thermal expansion effect, and the extent of such an effect increases as the length of the organic molecules increases.

Printed on paper containing at least 50% wastepaper, including 10% post consumer waste.However the lengthy thermal process used in that tool is not viewed as a commercially scalable process, primarily due to its extended process time. Therefore the effort to use an RTP process was launched at the beginning of the project in order to develop a faster absorber formation process for eventual transfer to Solexant's pilot process line. Characterization ToolsSolexant has an array of analytical tools in-house that were used extensively throughout this project effort. These tools include scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron beam induced current (EBIC), electron dispersive spectroscopy (EDS), white-light interferometry, Infrared Thermography, optical absorption spectroscopy, xray fluorescence (XRF), capacitance-voltage (C-V), current-voltage (I-V) and light-biased quantum efficiency (QE). We had collaborative efforts with NREL's Measurement and Characterization group for lock-in Infrared Thermography, SEM, focused ion beam (FIB)-SEM and EDS, STEM, EBIC, cathodoluminescence (CL) and Raman.

A group of copper iodide based hybrid semiconductors with the general formula of 2D-CuI(L) 0.5 (L = organic ligands) are synthesized and structurally characterized.All compounds are two-dimensional (2D) networks made of one-dimensional (1D) copper iodide staircase chains that are interconnected by bidentate Nitrogen containing ligands. Results from optical absorption and emission experiments and density functional theory (DFT) calculations reveal that their photoluminescence (PL) can be systematically tuned by adjusting the lowest unoccupied molecular orbital (LUMO) energies of the organic ligands. Charge carrier transport measurements were carried out for the first time on single crystals of selected 2D-CuI(L) 0.5 structures and the results show that they possess ptype conductivity with a Hall mobility of ~ 1 cm 2 V -1 s -1 for 2D-CuI(pm) 0.5 and 0.13 cm 2 V -1 s -1 for 2D-CuI(pz) 0.5 , respectively. These values are comparable to or higher than the mobilities of typical highly luminescent organic semiconductors. This work suggests that robust, high-dimensional copper iodide hybrid semiconductors are promising candidates to be considered as a new type of emissive layers for LED devices.