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Efficient and stable perovskite-silicon two-terminal tandem solar cells

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Rare Metals 2020年第7期39卷 745-747页

作者： mustafa haider Jun-Liang Yang State Key Laboratory of Powder Metallurgy School of Physics and ElectronicsCentral South UniversityChangsha 410083China

In the past several years, perovskite solar cells (PSCs)exhibited unexpected breakthrough and rapid evolution,and the power conversion efficiency (PCE) of singlejunction PSCs has been increased significantly from 3.81 to25.2%[1, 2], resulting from materials engineering, interface engineering, crystallization engineering, fabrication engineering, etc.[3-5]. In the case of silicon solar cells.

关键词： perovskite breakthrough crystallization

Boosting efficiency and stability of perovskite solar cells with nickel phthalocyanine as a low-cost hole transporting layer material

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Journal of Materials Science & Technology 2018年第9期34卷 1474-1480页

作者： mustafa haider Chao Zhen Tingting Wu Gang Liu Hui-Ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China University of Chinese Academy of Sciences 19(A) Yuquan Road Beijing 100049 China School of Materials Science and Engineering University of Science and Technology of China 72 Wenhua Road Shenyang 110016 China Low-Dimensional Material and Device Laboratory Tsinghua-Berkeley Shenzhen Institute Tsinghua University 1001 Xueyuan Road Shenzhen 518055China Center of Excellence in Environmental Studies King Abdulaziz University Jeddah 21589 Saudi Arabia

The efficiency of perovskite solar cells（PSCs） has increased from around 4% to over 22% following a few years of intensive investigation. For most PSCs, organic materials such as 2,2＇,7,7＇-tetrakis（N,Npdimethoxyphenylamino）-9,9＇-spirobifluorene（spiro-OMeTAD） are used as the hole transporting materials（HTMs）, which are thermally and chemically unstable and also expensive. Here, we explored nickel phthalocyanine（NiPc） as a stable and cost-effective HTM to replace the conventionally used spiroOMeTAD. Because of its high carrier mobility and proper band alignments, we achieved a PCE of 12.1% on NiPc based planar device with short-circuit current density（Jsc） of 17.64 mAcm（-2）, open circuit voltage（Voc） of 0.94 V, and fill factor（FF） of 73%, outperforming the planar device based on copper phthalocyanine（CuPc） that is an outstanding representative of metal phthalocyanines（MPcs） reported. Moreover,the device with NiPc shows much improved stability compared to that based on the conventional spiroOMeTAD as a result of NiPc＇s high stability. Photoluminescence（PL） and Impedance spectroscopy analysis results show that thermally deposited NiPc has good hole-extraction ability. Our results suggest that NiPc is a promising HTM for the large area, low cost and stable PSCs.

关键词： Solar cells Perovskite Hole transfer material

Chlorine capped SnO_2 quantum-dots modi?ed TiO_2 electron selective layer to enhance the performance of planar perovskite solar cells

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Science Bulletin 2019年第8期64卷 547-552页

作者： Tingting Wu Chao Zhen Jinbo Wu Chunxu Jia mustafa haider Lianzhou Wang Gang Liu Hui-Ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China University of Chinese Academy of Sciences Nanomaterials Centre School of Chemical Engineering and AIBN The University of Queensland Low-Dimensional Material and Device Laboratory Tsinghua-Berkeley Shenzhen Institute Tsinghua University

SnO_2 quantum dots(QDs) ended with chlorine ions are introduced at the interface of spin-coated TiO_2 electron selective layer(ESL)/perovskite to fill the pinholes in the layer and passivate the trapping defects. As a result of the increased interface electron collection and reduced bulk recombination, the planar perovskite solar cell with the QDs modified ESL gives the large power conversion efficiency enhancement from 14.9% to 17.3% and greatly improved stability under the continuous light irradiation.

关键词： TiO2 SnO2 quantum dots Interface modification Perovskite solar cells

A flexible nickel phthalocyanine resistive random access memory with multi-level data storage capability

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Journal of Materials Science & Technology 2021年第27期86卷 151-157页

作者： Tariq Aziz Yun Sun Zu-Heng Wu mustafa haider Ting-Yu Qu Azim Khan Chao Zhen Qi Liu Hui-Ming Cheng Dong-Ming Sun Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang110016China University of Chinese Academy of Sciences 19A Yuquan RoadBeijing100049China School of Material Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang110016China Key Laboratory of Microelectronic Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of Sciences3 Bei-Tu-Cheng West RoadBeijing100029China Pak-Austria Fachhochschule:Institute of Applied Sciences and Technology MangKhanpur RoadHaripurKPKPakistan NUS Graduate School Integrative Sciences and Engineering ProgrammeNational University of Singapore119077Singapore Frontier Institute of Chip and System Fudan University2005 Songhu RoadShanghai 200433China Shenzhen Geim Graphene Center Shenzhen International Graduate SchoolTsinghua University1001 Xueyuan RoadShenzhen518055China

Metal phthalocyanine is considered one of the most promising candidates for the design and fabrication of flexible resistive random access memory(RRAM)devices due to its intrinsic flexibility and excellent ***,performance degradation and the lack of multi-level capability,which can directly expand the storage capacity in one memory cell without sacrificing additional layout area,are the primary obstacles to the use of metal phthalocyanine RRAMs in information ***,a flexible RRAM with pristine nickel phthalocyanine(Ni Pc)as the resistive layer is reported for multi-level data *** to its high trap-concentration,the charge transport behavior of the device agrees well with classical space charge limited conduction controlled by traps,leading to an excellent performance,including a high on-off current ratio of 10^(7),a long-term retention of 10^(6)s,a reproducible endurance over6000 cycles,long-term flexibility at a bending strain of 0.6%,a write speed of 50 ns under sequential bias pulses and the capability of multi-level data storage with reliable retention and uniformity.

关键词： Flexible Metal phthalocyanine Resistive random access memory Multi-level

Upper Gastrointestinal Endoscopic Outcomes in Patients with Gastrointestinal Symptoms: Retrospective Analysis at a Tertiary Care Hospital

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Open Journal of Gastroenterology 2019年第8期9卷 141-157页

作者： Iftikhar haider Naqvi Abu Talib Muqadus Tabraze Omer mustafa Siddiqui Maheen Fatima Hussaini Neha Saleem Paryani Rida Effendi Samrah lnam Siddiqui Syeda Zuhaa Hassan Maham Munawar Zaiya Waseem Ameer Ahmed Khan Zafir Zohab Hussain Khan S. Zain Naeem Rizvi Sofia Fatima Farooqui Misbah Munaf Hasan Obaid Faryal Khan Dow University of Health Sciences Department of Medicine Karachi Pakistan

Background: Endoscopic procedures are frequently performed to rule out any disease process which eventuates with either a positive or negative outcome. Association of patient demographics, clinical features with endoscopic outcomes are of paramount importance for better understanding and practice of endoscopy. Objectives: This study aimed to determine the frequency of positive endoscopic findings in patients with gastrointestinal symptoms compared to those with negative findings. As a secondary objective, the association between relevant demographics, symptoms, laboratory investigations and procedural outcomes of the participants and positive endoscopic findings were also assessed. Methods: A retrospective analysis of all the patients who underwent esophagogastroduodenoscopy from January 2017 to December 2017 was conducted. A total of 1066 endoscopy records were retrieved and using a convenience sampling technique, relevant data were manually entered to the questionnaires. Records with incomplete or inconsistent data were disregarded as per the exclusion criteria, resulting in 1011 patient records ultimately utilized for the study. All data were entered and analyzed using IBM SPSS 23.0. Results: The study comprised a total of 1011 patients where 52.2% were females and 47.8% males while the mean age of patients was 42.16 ± 15.45. Positive endoscopic findings were observed in 88.1%, where the most common finding was gastritis (49.1%). Approximately 14.5% had positive investigation findings for HBsAg and 23.1% were seropositive for anti-HCV antibody. P-values statistically significant were for age (p = 0.044), hematemesis (p = 0.002), betel quid addiction (p = 0.044), anti-HCV antibody (p = 0.043), HCV-RNA (p = 0.041) and “H. pylori” antigen (p = 0.032). Conclusion: Both genders were almost equally included where most patients presented between the 3rd and 5th decades of life. A high incidence of gastritis was noted. Positive endoscopic findings were associated with be

关键词： Esophagogastroduodenoscopy Endoscopy Gastritis Esophageal Varices