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Publication
Featured researches published by Hunglin Chen.
china semiconductor technology international conference | 2017
Yin Long; Rongwei Fan; Hunglin Chen; Haihua Li
The research aims at the VC (voltage contrast) of contact-loop defects in 28nm processes. A new type defect, contact W (tungsten) missing, was found during process developments, and the designed inline E-beam inspection was used to detect those defects by their VC features. The mechanism of defects and the method of the enhancement of the detection were described. An extreme high signal E-beam scan recipe is required in corresponding to the unique defect wanted and, in doing so, the partial-opened W missing defects can be found. Since the defect can be detected instantly by E-beam inspection, and therefore an inline monitoring index can be set up. Compared to the end-of-line electrical test, this inline monitor is very much closer to the trouble process and shrinks the response time. The following process experiments and evaluation can be instantly verified and examined. Finally, the W missing defect was fixed by an optimization of CT Etch process and controlling of CT loop minienvironment. Instead to the debug method of failure analysis, E-beam inspection can speed up 8nm development.
china semiconductor technology international conference | 2018
Rongwei Fan; Hunglin Chen; Kai Wang; Zuoyue Liu; Yin Long; Qiliang Ni; Xiaofang Gu
The study aims at the inline detection of invisible defects of tungsten (W) plug voids. Those voids inside contact holes would directly lead to chip yield fail or, even worse, reliability issues. A dedicated electron-beam (E-beam) inspection (EBI) method with “penetration mode” was performed to detect W plug voids. Then experiments showed the failure model involved poor CT hole profiles, the accumulating polymers in the CT hole, incompatible ILB/W DEP processes; furthermore, the quantified impacted factors of void defects were also discussed, including the aspect ratio (AR) and shape of CT holes, CT etch polymer status, the thermal effect of ILB/W DEP processes, and even the FOUP materials. The corresponding improvement actions including changing new material FOUP, reducing CT hole AR by optimization of the ILD loop and CT loop process and optimizing the ILB/W DEP process were executed. The W plug void defects obviously trended low accordingly.
china semiconductor technology international conference | 2018
Xingdi Zhang; Hunglin Chen; Yin Long; Qiliang Ni; Rongwei Fan; Kai Wang
In this paper, extreme tiny defects are detected and monitored by using brightfiled inspection system in 28nm back-end-of-the-line (BEOL) processes. Two main defects, including tiny bridge and tiny bump defects, were studied by a novel combination of dedicated scan settings such as spectrum mode, directional electrical field (DEF), focus offset and so on. The purpose of these studies is to capture defects more efficiently. After defect detecting, failure models of these defects were established and the effective defect reduction actions were carried out. Combining effective defect monitor and defect reduction actions can make BEOL yield improve rapidly.
china semiconductor technology international conference | 2015
Zengyi Yuan; Qiliang Ni; Hunglin Chen; Yin Long
This work aims at the auto focus failure of dark field inspection tools used in 55/40 nm technologies. The diversification of progresses and products come along with the progress of semiconductor advanced; however, the auto focus (AF) system of traditional darkfield inspection riggings is insufficient to cover all process conditions, which could cause the interruption of the inspection process and additional dummy time. The AF system works with the inspection process in parallel, but the scan will be stopped once the wafer is too dark to reflect enough light to the AF system. The CIS (CMOS Image Sensor) product feature is unique, and which would lead to the low light signal and high failure rate. A series of experiments were carried out, and the high value of the incident light intensity can obviously reduce the fail rate (by wafer) from 40% to 10%. Furthermore, to switch the light sources into 780 nm wavelength, the problem can be fixed thoroughly, and the failure rate tended down to zero accordingly.
china semiconductor technology international conference | 2015
Rongwei Fan; Hunglin Chen; Yin Long; Qiliang Ni; Kai Wang; Zhibin He; Zhengkai Yang; Yanyun Wang; Liang Ni
The research was aimed at the inline detection of the electron leakage leading to end-of-the-line soft failures. The electron beam inspection was applied to detect the voltage contrast signal by the PMOS leakage, and the leakage would lead to SRAM data retention failures in CP test during 40nm technology development. A series of experiments, including retargeting the CD of NP lithography process and re-tape-out the mask with new optical proximity correct (OPC), were set up according to the inline detectable VC inspection method, and an optimal process integration condition without failures was achieved.
Archive | 2013
Rongwei Fan; Feijue Liu; Yin Long; Qiliang Ni; Hunglin Chen
ECS Transactions | 2014
Xiaofang Gu; Hunglin Chen; Yin Long; Qiliang Ni; Rongwei Fan
ECS Transactions | 2014
Qiliang Ni; Hunglin Chen; Kai Wang; Yin Long; Rongwei Fang
Archive | 2013
Kai Wang; Hunglin Chen; Yin Long; Qiliang Ni; MingShen Kuo
Archive | 2007
Kegang Zhang; Hunglin Chen; Yin Long; Qiliang Ni; Wenlei Chen; Yanbo Shangguan; Xiaorong Zhu