Abstract:
Polymer can be removed on the back side of a workpiece and photoresist can be removed on the front side of the workpiece. In case that polymer(500) of the back side is removed, the wafer is located on the remote plasma source having a side output port(510) passing through the sidewall of the chamber, adjacent to the ceiling. The polymer of back side flows plasma by-products from the side output port to the wafer's backside. It is removed by rotating the workpiece. In case of the front side photoresist strip, the wafer is disposed beneath the side output port of the local plasma source, far from the ceiling. The front side photoresist flows plasma by-products from the side output port to the wafer backside. It is removed by rotating the workpiece.
Abstract:
A plasma reactor with ion distribution uniformity controller employing plural VHF sources is provided to change relative output power levels of a first and second VHF power sources by using a programmed controller. A ceiling electrode(226) faces a pedestal. A pedestal electrode is positioned in the pedestal. A first and second VHF power sources(240,242) of different frequencies are coupled to the same or to different ones of the ceiling electrode and the pedestal electrode. A controller is programmed to change relative output power levels of the first and second VHF power sources to increase the relative output power level of the first VHF power source whenever plasma ion distribution has a predominantly edge-high non-uniformity and to increase the relative output power level of the second VHF power source whenever the plasma ion distribution has a predominantly center-high non-uniformity.
Abstract:
A method for processing a workpiece in a plasma reactor with a variable height ground return path to control plasma ion density uniformity is provided to improve uniformity by adjusting band pass filters. RF power is coupled with plasma at a first VHF frequency by using one of electrodes of a chamber. A center ground return path for passing directly RF current is provided between a ceiling electrode(204) and a workpiece support electrode for the frequency. A variable height edge ground annular member is provided. A ground return path is provided through the edge ground annular member for the frequency. A distance between the variable height edge ground annular member and one of (a) height of a ceiling electrode or (b) height of a workpiece support electrode is controlled to control the uniformity of the radial plasma ion density distribution.
Abstract:
A method for increasing plasma process uniformity to a wafer by allocating power to a plurality of VHF sources is provided to improve the uniformity by adjusting current to a channel directed to a center. A method for increasing plasma process uniformity to a wafer includes a method for processing a workpiece in a plasma reactor chamber having electrodes including at least a ceiling electrode and a workpiece supporting electrode. A coupling process is performed to couple RF power sources of VHF frequencies f1 and f2 with one of each of the electrodes and a common electrode of the electrodes(300). The f1 is sufficiently high to produce a non-uniform plasma ion distribution having a high center and the f2 is sufficiently low to produce a non-uniform plasma ion distribution having a low center. An adjusting process is performed to adjust a ratio of an RF parameter at the f1 frequency to the RF parameter at the f2 frequency in order to control the plasma ion density distribution(306,308). The RF parameter is one of RF power, RF voltage, and RF current.
Abstract:
Embodiments of a cluster tool, processing chamber and method for processing a film stack are provided. In one embodiment, a method for in-situ etching of silicon and metal layers of a film stack is provided that includes the steps of etching an upper metal layer of the film stack in a processing chamber to expose a portion of an underlying silicon layer, and etching a trench in the silicon layer without removing the substrate from the processing chamber. The invention is particularly useful for thin film transistor fabrication for flat panel displays. ® KIPO & WIPO 2007
Abstract:
적어도 천정 전극 및 제품(workpiece) 지지 전극을 포함하는 전극들을 갖춘 플라즈마 반응기 챔버에 제품(workpiece)을 처리하는 방법이 제공된다. 상기 방법은 (a) 상기 전극들 각각의 하나에, 또는 (b) 상기 전극들 중 공통된 하나에 VHF 주파수들(f1, f2) 각각의 RF 전력 소스를 결합시키는 단계를 포함하며, f1은 중심부가 높은 불균일한 플라즈마 이온 분포를 생성하도록 충분히 높고 f2는 중심부가 낮은 불균일한 플라즈마 이온 분포를 생성하도록 충분히 낮다. 또한, 상기 방법은 플라즈마 이온 밀도 분포를 제어하기 위해 f1 주파수에서 RF 파라미터 대 f2 주파수에서 RF 파라미터의 비율을 조절하는 단계를 더 포함하며, RF 파라미터는 RF 전력, RF 전압 또는 RF 전류 중 임의의 하나이다.
Abstract:
가변 임피던스 분석을 이용하여 정합망의 등가 직렬 저항을 계산하는 방법 및 이를 이용하여 분석되는 정합망들의 실시예들이 본 발명에 제공된다. 일 실시예에서, 정합망의 등가 직렬 저항을 계산하는 방법은 정합망을 부하에 접속시키는 단계; 부하 임피던스들의 범위에 대해 상기 정합망의 출력을 측정하는 단계; 및 측정된 출력과 부하 저항 사이의 관계를 기초로 상기 정합망의 등가 직렬 저항을 계산하는 단계를 포함한다. 부하는 대용 부하일 수 있거나, 프로세스 챔버에 형성되는 플라즈마일 수 있다.
Abstract:
A method for characterizing a matching network is provided to improve a matching accuracy by preventing an RF(Radio Frequency) measuring accuracy level from affecting an accuracy of an ESR approximation. A method for characterizing a matching network(106) includes a connection process, which couples the matching network with a load(104). An output of the matching network is measured within a range of load impedance. An ESR(Equivalent Series Resistance) of the matching network is calculated based on a relation between the measured output and the load resistance. The load is a variable impedance surrogate load. The surrogate load includes a tunable circuit, which generates various impedances within a target range. Conditions of the matching network are evaluated based on the calculated ESR.