LinkZill's HTL material has made progress in non-lead perovskite optoelectronic devices

Soochow University, Imperial College London andLinkZill co-authored the paper entitled "Enhanced photoconversion efficiency in cesium-antimony-halide perovskite derivatives by tuning crystallographic dimensionality" was published in the journal of Applied Materials Today.

ABSTRACT :

Lead-basedperovskites have reached prominence in optoelectronic and photovoltaicresearch, yet their toxicity has prompted the search for alternative lead-freecompounds. All-inorganic antimony-/bismuth halide perovskite derivatives havebeen identified as a promising class of materials. Despite attractive bulkoptoelectronic properties, their optoelectronic device performance has beenlagging behind. Here we examine one of their most promising embodiments, theall-inorganic cesium-antimony-halide system. Through solution-based halidemixing, we achieve its structural conversion from a zero-dimensional to alayered phase at processing temperatures < 150 °C, i.e., much lower than those relied uponin the prior literature ( ≥230 °C) ofall-inorganic cesium-antimony halides. In order to evaluate the technologicalsignificance of this finding, we integrate our layered films into asandwich-type device structure, and characterize their external quantumefficiency and photovoltaic behavior. We find that the structural conversionleads to a considerable enhancement in the optoelectronic device performance.Additionally, photocurrent-power characterization and Hall effect measurementsreveal that this performance enhancement is brought about by an improvement incharge carrier transport, which can be exploited due to the unoriented natureof our low-temperature-processed layered films. Such performance boost andmechanistic insight constitute an important step in realizing the fullpotential of these (and related) compounds for their application in lead-freeoptoelectronic and photovoltaic devices, e.g., for top-cell in tandemphotovoltaics, indoor photovoltaics, and photodetectors.

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