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BaCuChF (Ch = S, Se, Te) is a non-oxide wide-bandgap p-type semiconductor. This combination of properties is quite rare, but very desirable for applications in optoelectronic devices, such as CdTe and CIGS solar cells, organic bulk heterojunction solar cells and organic light-emitting diodes (OLEDs). Realization of BaCuChF in these thin film devices requires a fundamental understanding of its surface and interfacial properties. The first part of my talk will be focused on basic principles of x-ray and ultraviolet photoelectron spectroscopy techniques (XPS/UPS).