The researchers — who are based at Nanjing Forestry University, the Nanjing University of Science and Technology, the Northeast Forestry University, South China Agricultural University and Scion — used a transparent wood film substrate and a conductive cellulose-based ink to fabricate flexible electronics that can be bent, folded and rolled. To make the transparent substrate, a delignification process

The researchers — who are based at the Hong Kong University of Science and Technology, the City University of Hong Kong and the École Polytechnique Fédérale de Lausanne — tune the spatial organization of biomolecular inks through electrohydrodynamic aerosolization and in situ electrical poling. Films printed from β-glycine–polyvinylpyrrolidone have a piezoelectric voltage coefficient of 190 × 10−3

The researchers — who are based at the University of Illinois Urbana-Champaign — show that in certain compound semiconductors the defects self-organize into electrically neutral complexes. These push deep-level traps closer to the conduction band edge, where they act as donors. So rather than degrade performance, the CuIn5Se8 field-effect transistors with introduced defects show better performance