High efficiency perovskite solar cells were fabricated reproducibly via Lewis base adduct of lead(II) iodide. PbI2 was dissolved in N,N-dimethyformamide with equimolar N,N-dimethyl sulfoxide (DMSO) and CH3NH3I. Stretching vibration S═O appeared at 1045 cm(-1) for bare DMSO, which shifted to 1020 1015 upon reacting DMSO + CH3NH3I, respectively, indicative forming the PbI2·DMSO CH3NH3I·PbI2·DMSO due interaction between and/or iodide (I(-)) acid PbI2. Spin-coating a DMF solution containing...

Perovskite solar cells have shown fast deterioration during actual operation even with encapsulation, but its mechanism has been elusive. We found the fundamental for irreversible degradation of perovskite materials in which trapped charges regardless polarity play a decisive role. A novel experimental setup utilizing different ions revealed that moisture induced dissociation is triggered by along grain boundaries. Our finding clearly explained intriguing observations why light soaking...

Mismatch of current (I)-voltage (V) curves with respect to the scan direction, so-called I–V hysteresis, raises critical issue in MAPbI3 (MA = CH3NH3) perovskite solar cell. Although ferroelectric and ion migration have been proposed as a basis for origin hysteresis has not apparently unraveled. We report here on cell that was systematically evaluated by interface-dependent electrode polarizations. Frequency (f)-dependent capacitance (C) revealed normal planar structure...

With rapid and brilliant progress in performance over recent years, perovskite solar cells have drawn increasing attention for portable power source applications.

Highly efficient transparent conductive oxide (TCO)-free perovskite (CH3NH3PbI3) solar cells are demonstrated by using a graphene anode and organic carrier transport materials. By adding few nanometer-thick MoO3 layer, wettability work function of the electrode enhanced to enable 17.1% power conversion efficiency, which is so far highest efficiency for TCO-free cells. As service our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed...

By employing the neutral plane concept, we demonstrated ultra-flexible perovskite solar cells that can withstand 100 cycles of crumpling.

Abstract Colloidal quantum dots (QDs) are attractive materials for realizing solution-processable laser diodes that could benefit from size-controlled emission wavelengths, low optical-gain thresholds and ease of integration with photonic electronic circuits 1–7 . However, the implementation such devices has been hampered by fast Auger recombination gain-active multicarrier states 1,8 , poor stability QD films at high current densities 9,10 difficulty to obtain net optical gain in a complex...

Transparent carbon electrodes, nanotubes, and graphene were used as the bottom electrode in flexible inverted perovskite solar cells. Their photovoltaic performance mechanical resilience compared analyzed using various techniques. Whereas a conventional cells indium tin oxide showed power conversion efficiency of 17.8%, nanotube- graphene-based efficiencies 12.8% 14.2%, respectively. An established MoO3 doping was for electrode-based devices. The difference between due to morphology...

A simple, low-cost, large area, and continuous scalable coating method is proposed for the fabrication of hybrid organic-inorganic perovskite solar cells. megasonic spray-coating utilizing a 1.7 MHz nebulizer that could fabricate reproducible large-area planar efficient films developed. The fabricates uniform film with large-sized grain since smaller narrower sized mist droplets than those generated by existing ultrasonic spray methods be spraying. volume flow rate CH3 NH3 PbI3 precursor...

Carbon-sandwiched perovskite solar cells have long-term stability and are low cost.

We report a theoretical analysis on the crystallization of CH₃NH₃PbI₃and control grain sizes by varying two-step reaction temperature from −10 °C to 50 based present analysis.

Janus-compartmental alginate microbeads having two divided phases of sensory polydiacetylene (PDA) liposomes and magnetic nanoparticles were fabricated for facile applications. The are composed PDA label-free signal generation 1,2-dipalmitoyl-sn-glycero-3-galloyl (DPGG) lipids whose galloyl headgroup has specific interactions with lead(II). second phase is designed convenient handling the microbeads, such as washing, solvent exchange, stirring, detection, by applying field. Selective...

A water-repellent perovskite solar cell was developed based on anti-reflective lotus leaf-inspired hierarchical pyramidal arrays with enhanced self-cleaning characteristics and prepared by the replica molding of micro pyramid structures Ar ion surface treatment. The power conversion efficiency CH3NH3PbI3 improved from 13.12% to 14.01% employing such a bifunctional polydimethylsiloxane (PDMS) film due an anti-reflection effect. Moreover, PDMS adhered demonstrated excellent...

A HC(NH₂)₂PbI₃perovskite solar cell based on TiO₂nanohelices has been developed.

Herein, we developed a novel electrospray coating system for continuous fabrication of perovskite solar cells with high performance. Our can systemically control the size CH3NH3PbI3 precursor droplets by modulating applied electrical potential, shown to be crucial factor formation films. As result, have obtained pinhole-free and large grain-sized cells, yielding best PCE 13.27% little photocurrent hysteresis. Furthermore, average through process was 11.56 ± 0.52%. demonstrates not only...

It is unmistakably paradoxical that the most vulnerable aspect of photoactive organic-inorganic hybrid perovskite its instability against light. Why and how perovskites break down under light irradiation what happens at atomistic level these materials during degradation process still remain unanswered. In this paper, we found culprit verified mechanism for irreversible from our experimental investigation ab initio molecular dynamics (AIMD) simulation. We initially electrostatic charges...

Colloidal quantum dots (QDs) are attractive materials for the realization of solution-processable laser diodes. Primary challenges towards this objective fast optical-gain relaxation due to nonradiative Auger recombination and poor stability colloidal QD solids under high current densities required obtain optical gain. Here we resolve these achieve broad-band gain spanning band-edge (1S) higher-energy (1P) transitions. This demonstration is enabled by continuously graded QDs with strongly...

Present-day liquid-state lasers are based on organic dyes. Here we demonstrate an alternative class of liquid that use solutions colloidal quantum dots (QDs). Previous efforts to realize such devices have been hampered by the fast non-radiative Auger recombination multicarrier states required for optical gain. overcome this challenge using type-(I + II) QDs, which feature a trion-like gain state with strongly suppressed recombination. When combined Littrow cavity, static (non-circulated)...

Perovskite solar cells (PSCs) have achieved power-conversion efficiency of 25.2%; however, their working principle remains under debate, and the stability issue has not been solved. Herein, we reveal that PSCs are governed by a dominant p–n junction occurring at different interfaces depending on electron-transporting layer (ETL) charge accumulation is mainly concentrated corresponding where degradation initiated. To confirm this, investigated effect ETL junction, electric field, carrier...

Laser diodes based on solution-processable materials can benefit numerous technologies including integrated electronics and photonics, telecommunications, medical diagnostics. An attractive system for implementing these devices is colloidal semiconductor quantum dots (QDs). The progress towards a QD laser diode has been hampered by rapid nonradiative Auger decay of optical-gain-active multicarrier states, fast device degradation at high current densities required action, unfavorable...

We rationally designed highly sensitive and selective polydiacetylene (PDA)–phospholipids liposomes for the facile detection of aminoglycosidic antibiotics. The detecting mechanism mimics cellular membrane interactions between neomycin phosphatidylinositol-4,5-bisphosphate (PIP2) phospholipids. developed PDA–PIP2 sensory system showed a limit 61 ppb was very specific to antibodies only.