Multifunctional Deformable Organic Semiconductor Single Crystals

Abstract

We report the first organic semiconductor crystal with au nique combination of properties that can be used as am ultifunctional optoelectronic device.M echanically flexible single crystals of 9,10-bis(phenylethynyl)anthracene (BPEA) can function as aphototransistor,photoswitch, and an optical waveguide.The material can exist as two structurally different solid phases,w ith single crystals of one of the phases being elastic at room temperature while those of the other are brittle and become plastic at higher temperature.T he output and transfer characteristics of the devices were characterized by measuring the generation and temporal response of the switching of the photogenerated current. The current-voltage characteristics of both phases exhibit linearity and symmetry about the positive and negative voltages.The crystals transmit light in the telecommunications range with significantly low optical loss for an organic crystalline material.

New insights into structure/optical waveguide behavior relationships in linear bisethynylbenzenes

“…This effect has been shown to justify the different waveguiding behavior in different π-conjugated molecules. 60…”

Mechanoelectronics: Flexible Organic Semiconducting Single Crystals for Durable All-Flexible Field-Effect Transistors

“…The magnitude of mobility observed in these FETs is lower than that of DPP-diMe devices, but is comparable to many other well-known solution processable n-type and p-type semiconductors. 36,38,39 This lower mobility of DPP-diEt as compared to DPP-diMe can possibly be attributed to its larger πstacking distance (3.373 Å and 3.298 Å, respectively) between the molecular layers and smaller slipping angle (40º and 45º respectively). 1 The variation in the π-stacking distance between the molecular layers and difference in their slipping angles could be associated with the difference in the bulkiness of the alkyl side chains.…”

Mechanical Motion and Modulation of Thermal‐Actuation Properties in a Robust Organic Molecular Crystal Actuator

“…We believe that the controlled phase transition is related to the defects or dislocations since the migration rate of the habit plane is not consistent in different parts of crystals. Polymorphs usually process different physical and chemical properties such as photoelectric [ 19 ] and mechanical properties. [ 3c,20 ] Designing rationally a single crystal device with a coexistence of two adjustable phases is hopeful to accomplish a modulate physical property, thus to be applied as a thermal actuator such as a thermistor.…”