Author:
Vogtmeier Gereon,Drabe Christian,Dorscheid Ralf,Steadman Roger,Wolter Dr. Alexander
Abstract
AbstractThe foremost driver for the development of fully CMOS compatible Through Wafer Interconnects (TWIs) is the need of very large photodiode arrays for detectors, e.g. in computed tomography applications. The front to back-side contact allows the four-side buttable chip placement of the already large chips (20mm × 22mm2). The TWI technology allows an interconnection for chips up to 280μm thickness. This technique does not require any via opening at the font side, thus enabling a metal signal routing on the active side, on top of the interconnection. The application specific optical sensitive front-side of the chip is fully accessible. The production process is separated into three main steps. The first step is the implementation of the special TWI geometry into the CMOS substrate. Depending on the electrical and geometrical requirements of the circuit, different TWI structures are built with deep trenches (up to 280μm), which are passivated and filled with doped poly-silicon. The technologies used in this process, such as DRIE-etching, oxidation and low pressure CVD, are standard CMOS compatible processes. The use of poly-silicon prevents from achieving very low resistivity interconnections but allows the use of all CMOS process steps for an imager production (no temperature limitation – compared to other TWI process flows). The second step is the standard CMOS processing on the substrate already including the TWIs. The third step is a low temperature back-side process starting with wafer thinning down to 280μm or less to open the implemented TWI structure from the back-side. The thickness may be selected depending on the target application. A modified under ball metallization (UBM) process, which could include also re-routing of signals on the back-side, concludes the process flow until the solder ball placement, or similar bond connections.The special process flow opens a variety of applications which benefit from the full CMOS compatible processing and the accessible front-side.
Publisher
Springer Science and Business Media LLC
Reference8 articles.
1. 5. Spies L. , Morales F. , Steadman R. , Fiedler K. , Conrads N. , “Performance of prototype modules of a novel multislice CT detector based on CMOS photosensors”, Proceedings SPIE Medical Imaging Conf. 2003, vol. 5030, pp. 490–503
2. 4. Steadman R. , Vogtmeier G. , Kemna A. , Quossai S.E. Ibnou , Hosticka B. , “An In-Pixel Current-Mode Amplifier for Computed Tomography”, IEEE letters 2006
3. 1. Luhta R. , Chappo M. , Harwood B. , Mattson R. , Salk D. , Vrettos C. , “A new 2D-tiled detector for multislice CT”, Proceedings of the SPIE 6142, pp. 275–286, 2006
4. A CMOS photodiode array with in-pixel data acquisition system for computed tomography
5. 8. Bhardwaj J.K. , Ashraf H. , “Advanced silicon etching using high density plasmas”, Proc. SPIE Micromachining and Microfabrication Process Technology 2639 (1995), pp. 224–233