While not exactly image sensor related, Sensors journal published an open-access article on what appears to be SiOnyx "Black Silicon" competition:
Semiconducting Polymer Photodetectors with Electron and Hole Blocking Layers: High Detectivity in the Near-Infrared
Xiong Gong, Ming-Hong Tong, Sung Heum Park, Michelle Liu, Alex Jen and Alan J. Heeger
Center for Polymers and Organic Solids, University of California Santa Barbara, Santa Barbara, CA
Department of Materials Science and Engineering, University of Washington, Seattle, WA
Similarly to SiOnyx, the group of authors reported calculated detectivities greater than 1e13 Jones over a spectral range of 300-900 nm:
A linear dynamic range of approximately 130 dB was achieved. The article mentions that polymer detector spectral response can be extended into NIR range up to 1450nm.
Via Electrons and Holes blog.