Optical switching in semiconductor organic thin films

Abstract

Semiconducting organometallic films such as copper tetracyanoquinodimethane (CuTCNQ) have been observed to switch between two stable states when exposed to optical radiation. Observations of switching between two states in these films have been made by Raman spectroscopic methods and direct observation of electrical resistance changes. Line or pattern generation is observed for exposure above certain threshold levels. These effects are observed in a wide range of Cu and Ag organometallic compounds.

Nonvolatile Memory Elements Based on Organic Materials

“…On a more positive note, it is worth commenting that if the conducting paths are truly localized to just a few nanometers, then each bit-cell can be correspondingly small. This Review has focused on electrical devices, but other phenomena in organic and polymeric materials, such as optical [68,[100][101][102][103][104] and electromechanical [105,106] are also being explored. The use of a shift-register architecture with mechanical coupling of the memory elements [106] is an interesting approach to reducing cost, in that it permits the use of one write-element and one read-element to address an entire column of data.…”

Directed Integration of Tetracyanoquinodimethane‐Cu Organic Nanowires into Prefabricated Device Architectures

“…The resistivity of this material switches from a high-impedance state to a low-impedance state within a few nanoseconds upon the application of an electric field or under optical excitation. [18,19] Figure 6 shows typical I-V curves obtained for a TCNQ-Cu nanowire and for multiple nanowires grown between a 0.5 lm wide electrode trench structure upon cyclically sweeping the voltage up and down. These measurements have been made in air.…”

“…[18][19][20] Bulk and thin-film TCNQ-Cu devices have been widely studied in the past. [21,22] While the properties of TCNQ-Cu organic nanowires offer many advantages over their bulk and thin-film counterparts, their integration into high-density memory and sensor arrays is limited by the sensitivity of this organic nanomaterial during normal nanofabrication processing steps.…”

Photo-Induced Phase Transition in an Electron–Lattice Correlated System –Future Role of a Time-Resolved X-ray Measurement for Materials Science–

“…Over 17 years, extensive studies on PIPT have accumulated, and realistic examples have been reported for various materials, such as charge transfer (CT) crystals, [3][4][5][6][7][8][9] conjugated polymers, 10,11) transition metal-oxides, [12][13][14] spin crossover complexes, [15][16][17][18][19] Prussian-blue analogs, 20) the quantum structure of diluted magnetic semiconductors, 21) low-dimensional transition metal organo complexes, 22) and A 2 B molecular crystals. [23][24][25] In all examples, it is an essential and common concept to utilize the intrinsic instability of electronic, magnetic, and structural properties due to cooperative interaction to enhance the photoresponse.…”