Andrew B Greytak

Title: The Innovations of Andrew B Greytak

Introduction

Andrew B Greytak is a prominent inventor based in Columbia, SC (US). He has made significant contributions to the field of optoelectronics, holding a total of 5 patents. His work focuses on advancing technologies that enhance the performance and efficiency of electronic devices.

Latest Patents

One of Greytak's latest patents is titled "Spatially resolved Fourier Transform Impedance Spectroscopy and applications to optoelectronics." This invention discloses a method to spatially map and quickly build the frequency response of optoelectronic devices using optical probes. The transfer function of a linear system is derived from the Fourier transform of its impulse response, which can be obtained from transient photocurrent measurements of devices such as photodetectors and solar cells. Greytak applies this technique to a PbS colloidal quantum dot (QD)/SiC heterojunction photodiode, corroborating results with intensity-modulated photocurrent spectroscopy. The cutoff frequencies of the QD/SiC devices reached as high as approximately 10 kHz, showcasing their potential in advanced flexible and thin film electronics. The practical frequencies for Fourier Transform Impedance Spectroscopy lie in the mHz-kHz range, making it ideal for composite or novel materials like QD films that are influenced by interfacial trap states.

Another notable patent involves methods for producing a photovoltaic junction, which includes coating a bare junction with a composition. In this process, a plurality of quantum dots is used to create a film, which is then exposed to a ligand to form a first layer. The first layer is subsequently coated with the composition to form a film, and the film is exposed to the ligand again to create a second layer.

Career Highlights

Greytak has had a distinguished career, working at esteemed institutions such as the University of South Carolina and the Massachusetts Institute of Technology. His research has significantly impacted the field of optoelectronics, leading to advancements in device performance and applications.

Collaborations

Throughout his career, Greytak has collaborated with notable colleagues, including Mathew Kelley and Mvs Chandrashekhar. These collaborations have further enriched his research and contributions to the field.

Conclusion

Andrew B Greytak's innovative work in optoelectronics and his numerous patents highlight his role as