Solution-processed colloidal quantum dot photodiodes for low-cost SWIR imaging

Ethan J. D. Klem; Jay Lewis; Christopher Gregory; Garry Cunningham; Dorota Temple

doi:10.1117/12.919308

31 May 2012 Solution-processed colloidal quantum dot photodiodes for low-cost SWIR imaging

Ethan J. D. Klem, Jay Lewis, Christopher Gregory, Garry Cunningham, Dorota Temple

Proceedings Volume 8353, Infrared Technology and Applications XXXVIII; 835337 (2012) https://doi.org/10.1117/12.919308
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

While InGaAs-based focal plane arrays (FPAs) provide excellent detectivity and low noise for SWIR imaging applications, wider scale adoption of systems capable of working in this spectral range is limited by high costs, limited spectral response, and costly integration with Si ROIC devices. RTI has demonstrated a novel photodiode technology based on IR-absorbing solution-processed PbS colloidal quantum dots (CQD) that can overcome these limitations of InGaAs FPAs. We have fabricated devices with quantum efficiencies exceeding 50%, and detectivities that are competitive with that of InGaAs. Dark currents of ~2 nA/cm² were measured at temperatures compatible with solid state coolers. Additionally, by processing these devices entirely at room temperature we find them to be compatible with monolithic integration onto readout ICs, thereby removing any limitation on device size. We will show early efforts towards demonstrating a direct integration of this sensor technology onto a Si ROIC IC and describe a path towards fabricating sensors sensitive from the visible to 2200 nm at a cost comparable to that of CMOS based devices. This combination of high performance, dramatic cost reduction, and multispectral sensitivity is ideally suited to expand the use of SWIR imaging in current applications, as well as to address applications which require a multispectral sensitivity not met by existing technologies.

Citation Download Citation

Ethan J. D. Klem, Jay Lewis, Christopher Gregory, Garry Cunningham, and Dorota Temple "Solution-processed colloidal quantum dot photodiodes for low-cost SWIR imaging", Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 835337 (31 May 2012); https://doi.org/10.1117/12.919308

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