Frontier applications of perovskites beyond photovoltaics

Perovskites have been widely utilized as active materials in various optoelectronic devices, e.g. light-emitting diodes(LEDs), photodetectors(PDs), and solar cells(SCs), etc., due to their facile processability and outstanding optoelectronic properties.

Boosting the efficiency of quantum dot–sensitized solar cells over 15%through light-harvesting enhancement

How to improve the capacity of light-harvesting is still an important point and essential strategy for the assembling of high-efficiency quantum dot–sensitized solar cells(QDSCs).A believable approach is to implant new light absorption materials into QDSCs to stimulate the charge transfer.Herein,the few-layer black phosphorus quantum dots(BPQDs)are synthesized by electrochemical intercalation technology using bulk BP as source.Then the obtained BPQDs are deposited onto the surface of Zn–Cu–In–S–Se(ZCISSe)QD-sensitized TiO2 substrate to serve as another light-harvesting material for the first time.The experimental results have shown that BPQDs can not only increase the absorption intensity by photoanode but also reduce unnecessary charge recombination processes at the interface of photoanode/electrolyte.Through optimizing the size and deposition process of BPQDs,the champion power conversion efficiency of ZCISSe QDSCs is increased to 15.66%(26.88 mA/cm2,Voc=0.816 V,fill factor[FF]=0.714)when compared with the original value of 14.11%(Jsc=25.41 mA/cm^(2),Voc=0.779 V,FF=0.713).

Interface and surface engineering of black phosphorus: a review for optoelectronic and photonic applications

Since being rediscovered as an emerging 2D material,black phosphorus(BP),with an extraordinary energy structure and unusually strong interlayer interactions,offers new opportunities for optoelectronics and photonics.However,due to the thin atomic body and the ease of degradation with water and oxides,BP is highly sensitive to the surrounding environment.Therefore,high-quality engineering of interfaces and surfaces plays an essential role in BP-based applications.In this review,begun with a review of properties of BP,different strategies of interface and surfaces engineering for high ON-OFF ratio,enhanced optical absorption,and fast optical response are reviewed and highlighted,and recent state-of-the-art advances on optoelectronic and photonic devices are demonstrated.Finally,the opportunities and challenges for future BP-related research are considered.

Liquid-phase exfoliation of violet phosphorus for electronic applications

Large-scale production of two-dimensional(2D)materials still is a crucial point toward its practical applications.Violet phosphorus(VP)with a wide bandgap accelerates and broadens the potential applications of elemental phosphorus in optoelectronics.Here,we demonstrate the scalable production of solution-processable violet phosphorus flakes stably dispersed in several solvents.The exfoliated VP flakes exhibit thickness-dependent visible photoluminescence characteristics,which covers the shortcoming of black phosphorus.Meanwhile,the VP-based field-effect transistor reveals relatively competitive electrical properties to other liquid-phase exfoliated 2D materials.Our study paves the way for a wide range of applications of optical devices,energy storage,catalysis,and sodium batteries based on large-scale VP flakes.