Publication date: 3rd July 2020
The ligand exchange of 6-mercaptohexanol on the surface CuInS2 quantum dots not only improves their solution processability in alcoholic solvents such as methanol, ethanol and N,N-dimethylformamide, but also modulates their electrical bandgap and thus the charge injection and extraction at the charge transport interfaces. Bi-functional light-emitting and photodetection devices based on these alcohol-soluble CuInS2 quantum dots are realized adopting an inverted structure with ZnO as the electron transport layer and poly[(9,9- dioctylfluorenyl-2,7-diyl)-alt-(4,4‘-(N-(4-butylphenyl)diphenylaminel)] and poly(3,4- ethylenedioxythiophene):polystyrenesulfonate as the hole transport layers. The optimized device with selected active layer thickness exhibits red emission at 647 nm with a maximum luminance of 1600 cd/m2 under forward bias and works as a photodetector at zero bias with a maximum responsibility of 0.53 mA/W and a detectivity of 2.5×1010 Jones. Furthermore, with interface engineering of polyethylenimine ethoxylated (PEIE) layer at the electron transport side, more balanced charge injection is achieved, leading to reduce electroluminescence roll-off effect. The insulating PEIE layer also blocks the current leakage, giving rise to reduced dark current and improved detectivity of 3.5×1010 Jones. The effective bidirectional charge transfer achieved under simplified device design using the alcohol-soluble quantum dots brings a new candidate for multi-functional devices.
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