Iron Pyrite (FeS₂) Broad Spectral and Magnetically Responsive Photodetectors

Abstract

Earth‐abundant iron pyrite (FeS2) nanocrystals show great potential in broad photosensing applications due to their high photoabsorption coefficient (>105 cm−1) and ideal bandgap (0.95 eV). However, broad spectral photodetectors using the FeS2 nanojunctions and external stimuli‐driven photoresponse have not been demonstrated yet. Here, broad spectral FeS2/CdS bulk nanojunction photodetectors are demonstrated, covering the UV‐Vis‐NIR wavelength range. This is the first time shape‐dependent FeS2 nanocrystals and a dilute magnetic semiconductor phase exhibiting fast photoresponse time (10 ms) and high responsitivity (174.9 A/W) is demonstrated. Tunable photocurrent (73% change) is observed under the magnetic field effect due to the interdiffusion‐controlled diluted magnetic semiconductor CdFeS phase. The broad spectral FeS2‐based photodetectors open up a new tactic for solution‐processed next generation efficient and sustainable photosensing devices.

Ionic-passivated FeS2 photocapacitors for energy conversion and storage

“…The high performance BMII-passivated FeS 2 photocapacitors show a photoresponse of 37.6 A W À1 and photodetectivity of 1.6 Â 10 11 under 1100 nm illumination. The responsivity is one order of magnitude lower compared to bulk-nanojunction FeS 2 /CdS photodetectors (174.9 A W À1 ) 7 and one order of magnitude higher than that of the organic-inorganic blend of PbS/PCBM photodetectors (1.6 A W À1 ). 24 With the aim of testing FeS 2 photocharging ability, we evaluate the electrochemical capacitance measurements of FeS 2 photocapacitors under 1100 nm NIR light, and the cyclic voltammogram of FeS 2 photocapacitors is shown in Fig.…”

Scientific and Technological Assessment of Iron Pyrite for Use in Solar Devices

“…[9,33,34] Interestingly,ap yrite-marcasite mixed-phase thin film performed better than ap ure pyrite film in ap hotoelectrochemical cell, invalidating the belief that marcasite is detrimental to photon conversion.T his performance of the mixed phase film was attributed to improved charge separation. Despite the setback in the solar-cell application,i ron pyrite has been evaluated in many othero ptical devices such as high-responsivity photodetectors,n ear-IR photodiodes, [33,35,36] catalyst in dye-sensitizeds olar cells (DSSCs), [37,38] photoconductors, [39] or bulk-heterojunction inorganic-organic hybrids olar cells, [40] where appropriate post treatments and custom-designed device architecturesw ere successfully employed. This illustrates that the potential of the material can be harnessed by appropriate processing and device engineering for specific applications other than purely for light absorption.…”

Developing Seedless Growth of ZnO Micro/Nanowire Arrays towards ZnO/FeS2/CuI P-I-N Photodiode Application

“…These unique properties make it as a promising candidate for solar cells, photodetectors and counter electrode materials22232425. Even though, the rectification ratio of photodiode utilizing FeS 2 as a light absorber is limited due to large leakage current326, and low power conversion efficiency of solar cell is from low open-circuit voltage due to sulfur deficiencies and surface states20.…”