New polymer inspired by crystalline silicon to build better computers and solar cells

August 4, 2017, US Department of Energy
Finding new ways to make better materials for electronic circuits is one way to make a better device. A new polymer, called poly(cyclosilane) (bottom right), is essentially an ultra-small silicon “chip” that resembles a fragment of the atomic lattice of silicon (left), a foundational material found in most electronics. The chemical synthesis of the new polymer was possible due to a specially designed, novel building block (monomer) (top) that has a pattern of chemical connection points that allow growth of the polymeric structure in only the desired direction. Credit: US Department of Energy

One of the challenges in making new electronic devices is the chemistry required to assemble the layers that make up the device. In this research, a new synthetic chemistry approach produces ultra-small materials that resemble a fragment of the semiconductor silicon. The process uses a precisely defined pattern of reactive sites, or chemical "hooks." The hooks control the structure as the material, a polymer, grows. Being able to create small pieces of silicon-like materials may make it easier to manufacture designer electronic circuits with properties tuned for specific uses.

Silicon is a semiconductor. It is essential to defining modern technologies such as computer chips and . Access to new forms of this semiconductor can lead to new material properties. This research provides a synthetic chemical route to new forms of silicon-like . The resulting materials could change solar cells and computers.

Rational synthesis is the strategic choice of a sequence of chemical reactions leading to a desired chemical target. The application of rational synthesis leads to the creation of innovative and well-defined materials inaccessible by traditional manufacturing methods, such as cutting, machining and polishing. However, the small number of synthetic methods available to chemists to make silicon has limited the role of rational synthesis in developing new forms of this essential that is found in virtually all modern electronics. Researchers at the Johns Hopkins University addressed this challenge by developing new approaches to making molecules having cyclic silicon structures, as well as new methods for converting them to bulk material forms such as thin films or fibers. Chemists at Johns Hopkins University synthesized a new class of polymers they named poly(cyclosilane).

The new class of polymers contain repeating building blocks (monomers) that resemble part of the internal structure of elemental . The cyclosilane monomer contains a precisely defined pattern of reactive sites, or "hooks," that force the building block monomers to assemble in only one way. Poly(cyclosilane) exhibits promising optical properties and can be integrated with other electronically active materials to prepare novel functional materials. Such materials may have future utility in applications such as solution-processable solar cells or other electronic devices.

Explore further: New method promises easier nanoscale manufacturing

More information: Eric M. Press et al. Synthesis of a Fragment of Crystalline Silicon: Poly(Cyclosilane), Angewandte Chemie International Edition (2016). DOI: 10.1002/anie.201610208

Related Stories

New method promises easier nanoscale manufacturing

July 27, 2017

Scientists at the University of Chicago and Argonne National Laboratory have discovered a new way to precisely pattern nanomaterials that could open a new path to the next generation of everyday electronic devices.

Researchers develop new class of optoelectronic materials

April 11, 2017

Semiconductors are used for myriad optoelectronic devices. However, as devices get smaller and smaller and more demanding, new materials are needed to ensure that devices work with greater efficiency. Now, researchers at ...

Reimagining silicon

June 13, 2014

Silicon (Si) is ubiquitous in modern semiconductor manufacturing. Well-established procedures for its processing, perfected over more than five decades of industrial use, enable a diverse array of electronic devices that ...

Recommended for you

Infrared sensor as new method for drug discovery

July 19, 2018

Using an infrared sensor, biophysicists at Ruhr-Universität Bochum (RUB) have succeeded in analysing quickly and easily which active agents affect the structure of proteins and how long that effect lasts. Thus, Prof Dr. ...

Chemists characterize the fatal fungus among us

July 19, 2018

Life-threatening fungal infections affect more than two million people worldwide. Effective antifungal medications are very limited. Until now, one of the major challenges is that the fungal cell wall is poorly understood, ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.