The conduction band offset (CBO) of SnS as the light absorbing layer and Zn1−xMgxO as the buffer layer in SnS thin film solar cells has been optimized to improve the solar cell conversion efficiency. We controlled the CBO experimentally by varying the Mg content (x) of the Zn1−xMgxO layer. The optimum CBO value range for improved solar cell performance was determined to be from −0.1 to 0 eV. A SnS thin film solar cell sample with the optimum CBO value exhibited conversion efficiency of approximately 2.1%.
C2 production with conventional metal complex catalysts
has been a significant challenge. Here, we present the electrochemical
reduction of CO2 into C2 products such as ethylene
and ethanol with high selectivity using a self-assembled cuprous coordination
polymer nanoparticle (Cu-SCP). The features
of the Cu-SCP catalyst are the arrangement of Cu atoms in close proximity,
similar to that in metallic Cu, and a stable Cu(I) oxidation state
throughout the reaction due to the coordination of ligands with Cu
atoms, which inhibits conversion into Cu metal particles. The Cu-SCP
also exhibits activity for C2 production that is superior
to that of a Cu metal electrode, without modification of the carbon
particles and/or ionomers or continuous flow of the highly alkaline
electrolyte, which will simplify the fabrication of a CO2 electrolyzer. The Cu-SCP can be synthesized by a facile process
that utilizes a heterogeneous reaction, and the product selectivity
can be changed by replacement of the organic ligands, which should
open up possibilities for the design of other CO2 reduction
catalysts.
A p-type N-doped α-Fe2O3 was developed by magnetron sputtering of a Fe2O3 target in a plasma containing N2 and Ar followed by postannealing. Photoelectrochemical measurement under visible light irradiation (>410 nm) showed that N–Fe2O3 exhibits a typical cathodic photocurrent originated from the p-type conduction. X-ray photoemission spectroscopy indicated that the atomic N incorporated substitutionally at O sites was responsible for the p-type conduction. The concentration of acceptors was very close to that for Zn-doped Fe2O3, a typical p-type α-Fe2O3. This finding would stimulate further research on p-type Fe2O3 for solar fuel generation, etc.
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