Electron transport layers (ETLs) have been instrumental in breaking the efficiency boundaries of solution-processed photovoltaics. In particular, bilayer ETLs with an MgO top component have afforded tremendous success in various...
Several advances were reported in the field of organic photovoltaics in the last two years. Development and application of non-fullerene acceptors in particular has injected new life into the field. Exploitation of such materials in ternary blends and tandem solar cell structures has in fact enabled record high efficiencies >15%, thus paving the way towards commercialisation.
Introduction:Organic semiconductors (OS) rapidly became a success story for light-emitting diodes and then displays, now found in a plethora of commercial applications with further current focus on extending their performance in the near infra-red [1,2]. On the other hand, organic photovoltaics (OPVs) have lagged behind due to their limited efficiencies. Recently, advances in OPV research led to the fabrication of record high 17.3% [3••] efficient solar cells, thus demonstrating a potentially bright future for OPVs as well. The key competitive advantage of OPVs is their solutionprocessability which can offer low-cost fabrication of flexible devices over large areas [4]. They can also be semitransparent, and therefore penetrate into niche markets such as photovoltaic windows [5,6]. Indeed, OPVs have already shown excellent potential especially for wearable technologies and indoor energy generation [7,8].
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