Lithography and doping in strained Si towards atomically precise device fabrication

We investigate the ability to introduce strain into atomic-scale silicon device fabrication by performing hydrogen lithography and creating electrically active phosphorus δ-doped silicon on strained silicon-on-insulator (sSOI) substrates. Lithographic patterns were obtained by selectively desorbing hydrogen atoms from a H resist layer adsorbed on a clean, atomically flat sSOI(001) surface with a scanning tunnelling microscope tip operating in ultra-high vacuum. The influence of the tip-to-sample bias on the lithographic process was investigated allowing us to pattern feature-sizes from several microns down to 1.3 nm. In parallel we have investigated the impact of strain on the electrical properties of P:Si δ-doped layers. Despite the presence of strain inducing surface variations in the silicon substrate we still achieve high carrier densities (>1.0 × 1014 cm-2) with mobilities of ∼100 cm2 V-1 s-1. These results open up the possibility of a scanning-probe lithography approach to the fabrication of strained atomic-scale devices in silicon. © 2014 IOP Publishing Ltd

Does Corporate Social Responsibility Really Make a Difference? An Explorative Analysis for Chinese Companies

Many studies have been performed to assess the impacts of corporate social responsibility (CSR) on the financial performance of companies. There are, however, very few studies that analyze how CSR policies and instruments affect the realization of social and environmental CSR goals, such as the reduction of workplace accidents or CO2 emissions. Therefore, it remains uncertain to what extent CSR really contributes to sustainable development and whether it can serve as an alternative to government regulation to internalize external effects from market operation. The present study provides an explorative empirical analysis that aims to fill this gap. We employ regression analysis on a sample of 109 Chinese companies. The estimation results show that having a code of conduct stimulates the implementation of other organizational CSR instruments, but CSR implementation only partly affects the realization of CSR goals. Having codes of conduct without implementing CSR does not have a significant impact on societal welfare