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Carbazoles and their derivatives are ubiquitous in organic electronics since these compounds combine relatively low cost, chemical and thermal stability, and good hole transport properties, along with a tunable electronic structure. Thus, the application of carbazole molecules in the development of optoelectronic and photovoltaic devices, such as OLEDs and solar cells, has been explored with different patterns of functionalization (N-substitution, di- and polyfunctionalization) in the quest for increased efficiencies. In this review, we provide a brief overview of the basic aspects related to solar cells and OLEDs with a focus on the applications involving these versatile and promising building blocks. [ABSTRACT FROM AUTHOR]