Publication date: 15th July 2022
Lead halide perovskite nanocrystals (LHP NCs) combine facile fabrication, compositional bandgap tuning through the visible and excellent optoelectronic properties as a result of their defect-tolerant nature. Light harvesting devices based on LHP NCs, mostly rely on ligand washing protocols to produce electronic active NC arrays. However, such methodologies have issues related to complexity, reproducibility and the ambient and long-term stability of the treated NC electronic solids. An alternative approach that has been significantly less explored, is the fabrication of heterojunctions of the LHP NCs with other conductors similar to the concept of polymer-fullerene bulk heterojunctions. Blend structures in such cases can produce efficient exciton quenching at the inter material interfaces and potentially enable efficient charge extraction via conductive pathways through the donor and acceptor materials.
In this work, we study the electronic functionalization of green-emitting CsPbBr3 and red emitting CsPb(Br/I)3 NCs via mixing with the fullerene derivative PC70BM. The studied NCs are capped via short octylamine/octanoic-acid ligands, treated via a ligand washing protocol and mixed with fullerenes, yielding conductive solids. Spectroscopy on the produced samples indicates efficient exciton dissociation at the NC-fullerene heterointerface. Charge extraction and long-range charge transport are probed in simple hole and electron photoconductive lateral devices based on ITO and gold electrodes, respectively. Upon optimization of the fullerene component and application of thermal annealing post-processing, large improvement of the photoconductance is observed in blend compared to pristine NC devices. The improvement is much larger in gold-based devices, confirming that PC70BM acts as efficient electron acceptor and transporter in such hybrid composites.
This work was partially financially supported by the Research and Innovation Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS" Program.
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