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Organic light-emitting diodes consist of several layers of organic molecules just a few nanometers thick. In future, it may become possible to change the manufacturing process from vacuum deposition to a cost-effective liquid processing. This theoretical and practical investigation focuses on the underlying processes, in particular coating and drying, as well as the factors influencing the separation of individual layers in multilayer systems consisting of small molecules.

Schlitzgießen --- diffusion --- knife coating --- DiffusionOLED --- Mehrschichtsysteme --- Trocknung --- slot die coating --- SMOLED --- multilayer --- solution process --- drying --- Flüssigprozessierung --- Rakelbeschichtung --- Kleine Moleküle --- OLED --- Multischichten --- small molecules

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The direct conversion of sunlight into electricity (photovoltaic or PV for short) is evolving rapidly, and is a technology becoming a mainstream clean energy production method. However, to compete with conventional energy production methods using fossil fuels, the conversion efficiency needs to be increased, and the manufacturing cost should be reduced further. Both of these require the improvement of solar energy materials, and the device architectures used for the conversion of light into electrical energy. This Special Issue presents the latest developments in some solar energy materials like Si, CdTe, CIGS, SnS and Perovskites), and the device structures suitable for next generation solar cells. In particular, the progress in graded bandgap multi-layer solar cells are presented in this Special Issue.

electroplating --- semiconductors --- large-area electronics --- characterisation --- solar cells --- perovskite solar cell --- hole blocking layer --- solution spin-coating --- TiO2/SnO2 layer --- anti-reflection coating --- potential-induced degradation --- solar cell --- plasma enhanced chemical vapor deposition --- organic solar cells --- perovskite solar cells --- encapsulation --- stability --- Cu(In,Ga)Se2 --- mini-module --- numerical simulation --- P1 shunt --- space charge region (SCR) --- TCAD --- transistor effect --- electrodeposition --- CdTe film --- two-electrode configuration --- thin films --- electroplating temperature --- photovoltaic --- CdTe --- CdS --- luminescence --- spectroscopy --- CdSe --- CdTe1−xSex --- photovoltaics --- review --- tin monosulfide --- tin disulfide --- chemical solution process --- absorber --- buffer --- renewable energy --- ethlammonium --- formamidinium --- microstructure --- perovskite --- SnS/SnS2 --- CdS/CdTe --- CIGS --- silicon --- electroplating of semiconductors