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The mini‐slot‐die coater offers a simple, convenient, materials‐efficient route to print bulk‐heterojunction (BHJ) organic photovoltaics (OPVs) that show efficiencies similar to spin‐coating. Grazing‐incidence X‐ray diffraction (GIXD) and GI small‐angle X‐ray scattering (GISAXS) methods are used in real time to characterize the active‐layer formation during printing. A polymer‐aggregation–phase‐separation–crystallization...
A new diketopyrrolopyrrole‐based small molecule for solution‐processed OPVs is synthesized. The chemical additive has a profound effect in refining the morphology and, thus, significantly increases the efficiencies of the devices. The role of the additive is characterized by various techniques and the additive‐driven structure–property relationship is established, which reveals that the additive affects...
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