All-Small-Molecule Organic Solar Cells (ASM-OSCs) have reached 17% efficiency. Unlike polymers, SM synthesis is reproducible with controlled quality, making ASM-OSC highly relevant for commercialization. We perform extensive optoelectronic and microstructure characterization on high-performing ASM-OSC deposited via solution and vacuum thermal evaporation. We quantify absorption, voltage losses, and charge transport – probed via ellipsometry, sensitive EQE, and CELIV, respectively. To rationalize differences in charge carrier mobility, we construct the phase diagram and study phase separation via scattering methods. Example systems include ZnPc:C60, DCV5T-Me:C60, BTR:PCBM, and BTR-Cl:Y6. We find, e.g., that ASM-OSCs can achieve lower voltage losses than corresponding polymer-based OSCs.
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