Quantum Dot–Microbe Hybrid Systems for Solar-to-Chemical Conversion

Abstract

Quantum dot–microbe hybrid systems (QMHs) have emerged as a promising platform for semi-artificial photosynthesis by coupling the tunable photophysics of quantum dots (QDs) with the metabolic versatility of living microorganisms. Their performance depends not simply on light harvesting, but on how photogenerated carriers are separated, transferred, and utilized across the inorganic–biological interface. We argue that the central challenge in the field is bridging the spatiotemporal and energetic mismatch between ultrafast QD charge generation and the relatively sluggish pace of microbial redox catalysis. By distilling insights from recent advances in QD bandgap engineering, multi-exciton generation, and interfacial architecture, we highlight how interfacial energy transfer and electron flow can be optimized to drive complex, multi-electron reductive pathways. As the field transitions toward biocompatible, earth-abundant materials, the key question is shifting from whether QDs can interface with cells to how interfacial electron flow and microbial metabolism can be jointly engineered. This approach integrates materials design, interfacial charge dynamics, and synthetic biology to program microbial metabolism for high-value chemical synthesis. Ultimately, the future of QMHs lies in creating robust, scalable, and programmable biohybrid units capable of driving carbon fixation and other complex solar-to-chemical transformations beyond the native functional scope of natural photosynthesis.