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Keisuke Ohdaira,Takafumi Oikawa,Koichi Higashimine,Hideki Matsumura 한국물리학회 2016 Current Applied Physics Vol.16 No.9
The epitaxial growth of silicon (Si) films during the catalytic chemical vapor deposition (Cat-CVD) of intrinsic amorphous Si (i-a-Si) passivation films on crystalline Si (c-Si) wafers is suppressed by the oxidation of c-Si surfaces simply by dipping the c-Si wafers in hydrogen peroxide (H2O2). This oxidation treatment is also effective for (111)-oriented c-Si surfaces particularly at high a-Si deposition temperatures. The suppression of the epitaxial growth leads to the better effective minority carrier lifetime (teff) of c-Si wafers passivated with Cat-CVD i-a-Si films. SHJ solar cells show remarkably high open-circuit voltage (Voc) exceeding 0.7 V. These results clearly show the effectiveness of the insertion of SiOx layers on the improvement in Cat-CVD a-Si/c-Si interfaces.
Keisuke Yonamine,Shinsuke Koshita,Yoshihide Kanno,Takahisa Ogawa,Hiroaki Kusunose,Toshitaka Sakai,Kazuaki Miyamoto,Fumisato Kozakai,Hideyuki Anan,Haruka Okano,Masaya Oikawa,Takashi Tsuchiya,Takashi Sa 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.4
Background/Aims: We aimed to investigate (1) promising clinical findings for the recognition of focal type autoimmune pancreatitis (FAIP) and (2) the impact of endoscopic ultrasound (EUS)-guided tissue acquisition (EUS-TA) on the diagnosis of FAIP. Methods: Twenty-three patients with FAIP were involved in this study, and 44 patients with resected pancreatic ductal adenocarcinoma (PDAC) were included in the control group. Results: (1) Multivariate analysis revealed that homogeneous delayed enhancement on contrast-enhanced computed tomography was a significant factor indicative of FAIP compared to PDAC (90% vs. 7%, p=0.015). (2) For 13 of 17 FAIP patients (76.5%) who underwent EUS-TA, EUS-TA aided the diagnostic confirmation of AIPs, and only one patient (5.9%) was found to have AIP after surgery. On the other hand, of the six patients who did not undergo EUS-TA, three (50.0%) underwent surgery for pancreatic lesions. Conclusions: Homogeneous delayed enhancement on contrast-enhanced computed tomography was the most useful clinical factor for discriminating FAIPs from PDACs. EUS-TA is mandatory for diagnostic confirmation of FAIP lesions and can contribute to a reduction in the rate of unnecessary surgery for patients with FAIP.
Application of crystalline silicon surface oxidation to silicon heterojunction solar cells
Takafumi Oikawa,Keisuke Ohdaira,Koichi Higashimine,Hideki Matsumura 한국물리학회 2015 Current Applied Physics Vol.15 No.10
We study the effect of ultra-thin oxide (SiOx) layers inserted at the interfaces of silicon heterojunction (SHJ) solar cells on their open-circuit voltage (VOC). The SiOx layers can be easily formed by dipping c-Si into oxidant such as hydrogen peroxide (H2O2) and nitric acid (HNO3). We confirm the prevention of the undesirable epitaxial growth of Si layers during the deposition of a-Si films by the insertion of the ultrathin SiOx layers. The formation of the SiOx layers by H2O2 leads to better effective minority carrier lifetime (teff) and VOC than the case of using HNO3. c-Si with the ultra-thin SiOx layers formed by H2O2 dipping, prior to deposition of a-Si passivation layers, can have high implied VOC of up to ~0.714 V.
( Toshiaki Suzuki ),( Reina Ohba ),( Ei Kataoka ),( Yui Kudo ),( Akira Zeniya ),( Daisuke Segawa ),( Keisuke Oikawa ),( Masaru Odashima ),( Taiji Saga ),( Tomoyuki Kuramitsu ),( Hideaki Sasahara ),( K 대한소화기기능성질환·운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.1
Background/Aims Gastric acid secretion is suspected to be a pivotal contributor to the pathogenesis of functional dyspepsia. The present study investigates the potential association of the gastric acid secretion estimated by measuring serum pepsinogen with therapeutic responsiveness to the prokinetic drug acotiamide. Methods Dyspeptic patients consulting participating clinics from October 2017 to March 2019 were prospectively enrolled in the study. The dyspeptic symptoms were classified into postprandial distress syndrome (PDS) and epigastric pain syndrome (EPS). Gastric acid secretion levels were estimated by the Helicobacter pylori infection status and serum pepsinogen using established criteria and classified into hypo-, normo-, and hyper-secretion. Each patient was then administered 100 mg acotiamide thrice daily for 4 weeks, and the response rate to the treatment was evaluated using the overall treatment efficacy scale. Results Of the 86 enrolled patients, 56 (65.1%) and 26 (30.2%) were classified into PDS and EPS, respectively. The estimated gastric acid secretion was not significantly different between PDS and EPS. The response rates were 66.0% for PDS and 73.1% for EPS, showing no significant difference. While the response rates were stable, ranging from 61.0% to 75.0% regardless of the estimated gastric acid secretion level among subjects with PDF, the rates were significantly lower in hyper-secretors than in non-hyper-secretors among subjects with EPS (42.0% vs 83.0%, P = 0.046). Conclusion Although acotiamide is effective for treating EPS as well as PDS overall, the efficacy is somewhat limited in EPS with gastric acid hypersecretion, with gastric acid suppressants, such as proton pump inhibitors, being more suitable. (J Neurogastroenterol Motil 2022;28:53-61)
Hiroaki Kusunose,Shinsuke Koshita,Yoshihide Kanno,Takahisa Ogawa,Toshitaka Sakai,Keisuke Yonamine,Kazuaki Miyamoto,Fumisato Kozakai,Hideyuki Anan,Kazuki Endo,Haruka Okano,Masaya Oikawa,Takashi Tsuchiy 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.3
Background/Aims: This study aimed to clarify the efficacy and safety of pancreatic duct lavage cytology combined with a cell-block method (PLC-CB) for possible pancreatic ductal adenocarcinomas (PDACs). Methods: This study included 41 patients with suspected PDACs who underwent PLC-CB mainly because they were unfit for undergoing endoscopic ultrasonography-guided fine needle aspiration. A 6-Fr double lumen catheter was mainly used to perform PLC-CB. Final diagnoses were obtained from the findings of resected specimens or clinical outcomes during surveillance after PLC-CB. Results: Histocytological evaluations using PLC-CB were performed in 87.8% (36/41) of the patients. For 31 of the 36 patients, final diagnoses (invasive PDAC, 12; pancreatic carcinoma in situ, 5; benignancy, 14) were made, and the remaining five patients were excluded due to lack of surveillance periods after PLC-CB. For 31 patients, the sensitivity, specificity, and accuracy of PLC-CB for detecting malignancy were 94.1%, 100%, and 96.8%, respectively. In addition, they were 87.5%, 100%, and 94.1%, respectively, in 17 patients without pancreatic masses detectable using endoscopic ultrasonography. Four patients developed postprocedural pancreatitis, which improved with conservative therapy. Conclusions: PLC-CB has an excellent ability to detect malignancies in patients with possible PDACs, including pancreatic carcinoma in situ.