Abstract
Chemical degradation is a major disadvantage in the development of organic semiconductors. This work proposes the manufacture and characterization of organic semiconductor membranes in order to prevent semiconductor properties decreasing. Semiconductor membranes consisting of Nylon-11 and particles of π-conjugated molecular semiconductors were manufactured by high-vacuum evaporation followed by thermal relaxation. Initially, and with the aim of obtaining semiconductor particles, bulk heterojunction (BHJ) was carried out using green chemistry techniques between the zinc phthalocyanine (ZnPc) and the zinc hexadecafluoro-phthalocyanine (F16ZnPc) as n-type molecular semiconductors with the p-type molecular semiconductor dibenzotetrathiafulvalene (DBTTF). Consequently, the π-conjugated semiconductors particles were embedded in a Nylon-11 matrix and characterized, both structurally and considering their optical and electrical properties. Thin films of these materials were manufactured in order to comparatively study the membranes and precursor semiconductor particles. The membranes presented bandgap (Eg) values that were lower than those obtained in the films, which is an indicator of an improvement in their semiconductor capacity. Finally, the membranes were subjected to accelerated lighting conditions, to determine the stability of the polymer and the operating capacity of the membrane. After fatigue conditions, the electrical behavior of the proposed semiconductor membranes remained practically unaltered; therefore, they could have potential applications in molecular electronics. The chemical stability of membranes, which did not degrade in their polymer compound, nor in the semiconductor, was monitored by IR spectroscopy.
Highlights
Semiconductors are emerging as systems for biophysical tools and biomedical devices
The aim of the present work is to manufacture and characterize semiconductor membranes that consist of a Nylon-11 matrix and organic semiconductor particle (ONs) of zinc phthalocyanines (ZnPc and F16 ZnPc), joined by bulk heterojunction (BHJ) with dibenzotetrathiafulvalene (DBTTF)
The first stage was the characterization of ZnPc, F16 ZnPc and DBTTF precursors in terms of their solubility, melting/decomposition temperatures, and IR spectroscopy
Summary
Devices that integrate semiconductors have a rich set of physical properties that make them desirable targets for the design of next-generation biomedical devices Their intrinsic small size gives rise to both high spatial resolution and minimal invasiveness [1,2,3,4]. Most used in smart implantable drug delivery systems [5,6], these devices release any biological agent that is introduced into them in a small polymeric compartment called a transporter Another application is as sensors in noninvasive procedures, mainly because of their size and semiconductor qualities, making them susceptible to chemical and electrical changes [1,7,8]. The selection of an inorganic or organic semiconductor is very important, since
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