CIGS stands for Cu(In,Ga)Se2 which is absorber layer and CdS can be used as buffer layer in this solar cell. The cost effective technique for the preparation and to avoid toxic selenization step are the biggest challenge in this field. The efficiency of this solar cell is 19.9 % recently (Feb 2008) reported by NREL (National Renewable Energy Laboratory, USA). CIGS is promising candidate to replace Silicon solar cells.
I have been anxiously monitoring the development of CIGS solar. Once we solve the toxic selenization problem, i rather think the market will help drive the cost efficiecency issue into submission sooner rather than later.
The invertion of 10G optical transceiver has greatly increase the networking speed, for the science behind the transceiver, please check website and learn about CWDM SFP transceiver, www.fiberoptictransceiver.net
The XFP (10 Gigabit Small Form Factor Pluggable) is a standard for transceivers for high-speed computer network and telecommunication links that use optical fiber.please visit www.xfptransceiver.com for more info