No abstract

No abstract

The recent emerging progress of quantum dot ink (QD-ink) has overcome the complexity of multiple-step colloidal QD (CQD) film preparation and pronouncedly promoted the device performance. However, the detrimental hydroxyl (OH) ligands induced from synthesis procedure have not been completely removed. Here, a halide ligand additive strategy was devised to optimize QD-ink process. It simultaneously reduced sub-bandgap states and converted them into iodide-passivated surface, which increase carrier mobility of the QDs films and achieve thicker absorber with improved performances. The corresponding power conversion efficiency of this optimized device reached 10.78%. (The control device was 9.56%.) Therefore, this stratege can support as a candidate strategy to solve the QD original limitation caused by hydroxyl ligands, which is also compatible with other CQD-based optoelectronic devices.

Abstract-Liquid cooling using interlayer microchannels has appeared as a viable and scalable packaging technology for 3-D multiprocessor system-on-chips (MPSoCs). Microchannelbased liquid cooling, however, can substantially increase the onchip thermal gradients, which are undesirable for reliability, performance, and cooling efficiency. In this paper, we present GreenCool, an optimal design methodology for liquid-cooled 3-D MPSoCs. GreenCool simultaneously minimizes the cooling energy for a given system while maintaining thermal gradients and peak temperatures under safe limits. This is accomplished by tuning the heat transfer characteristics of the microchannels using channel width modulation. Channel width modulation is compatible with the current process technologies and incurs minimal additional fabrication costs. Through an extensive set of experiments, we show that channel width modulation is capable of complementing and enhancing the benefits of temperatureaware floorplanning. We also experiment with a 16-core 3-D system with stacked dynamic random-access memory, for which GreenCool improves energy efficiency by up to 53% with respect to no channel modulation.