http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : S. Sundar Kumar (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Ag back electrode bonding process for inverted organic solar cells
Kim, Honggyun,Kumar, Sandeep,Kim, Og Jin,Iyer, S. Sundar Kumar,Kim, Deok-kee Elsevier 2019 Journal of alloys and compounds Vol.777 No.-
<P><B>Abstract</B></P> <P>A new style of forming Ag back electrode for organic solar cells (OSCs) using a bonding process was compared with a conventional screen-printed <I>Ag</I>. All the fabrication process steps have been conducted under atmospheric conditions at room temperature without using a glove box. The OSCs with both screen-printed and bonded Ag back electrode exhibited comparable performances with the average power conversion efficiencies of 1.28% and 1.31%, respectively. The series and the shunt resistance values for the OSC with the bonded Ag were slightly better than those with the screen printed Ag. The binder resin at the interface between the PEDOT:PSS and the Ag may increase contact resistance for the screen-printed Ag process, while that between the Ag and the PET film for the bonded Ag process may not increase it. The bonding process for the Ag back electrode has the potential for future electronic device applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new style of forming Ag back electrode using a bonding process is proposed. </LI> <LI> All the process steps are conducted under atmospheric conditions at room temperature. </LI> <LI> The bonded Ag back electrode exhibited a comparable average performance. </LI> <LI> The binder resin for the bonded Ag process may not increase the series resistance. </LI> <LI> The bonding process forms an encapsulation simultaneously for protection. </LI> </UL> </P>
-
Arun Tej Mallajosyula,S. Sundar Kumar Iyer,Baquer Mazhari 한국물리학회 2013 Current Applied Physics Vol.13 No.4
P3HT:PCBM bulk heterojunction devices incorporating SWNTs, which are predominantly metallic in character, have been analyzed using impedance spectroscopy to understand the effect of SWNTs on their charge carrier transport properties. SWNTs reduce the effective lifetime of injected charge carriers. Frequency dependence of capacitance and conductance of P3HT:PCBM devices show monotonic variations without any clear peak positions. Simulations of the complex admittance of the P3HT:PCBM devices under trap free space charge limited current within the framework of SchereMontrol theory are used to qualitatively show that such characteristics are a signature of charge transport which is highly dispersive in nature. The position of peak speak in the imaginary part of impedance Im(Z), which is essentially same as the first transition frequency of ColeeCole plot, has a direct relation with the effective dc mobility of charge carriers which varies with dispersion parameters. Using the dc mobility values and the voltage variation of peak frequency of Im(Z), the ratio of sdc to speak has been calculated. The magnitude of this ratio is indicative of the degree of dispersiveness in transport. It has been shown that, SWNTs at low concentrations tend to reduce the dispersiveness in charge transport.
-
One cycle controlled three input three output DC to DC converter
P. Hema Rani,Arun Kumar Behera,Syam S. Sundar,Saly George,S. Ashok 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.1
A single renewable source is insufficient for providing a reliable and continuous power supply. The multi-input DC to DC converter (MIDC) provides for the hybridization of different energy sources with a single output. Various grid voltages exist and different applications require different DC voltages. If the MIDC provides multiple outputs, it becomes a multi-input multi-output (MIMO) converter. In this paper, a triple input triple output (TITO) DC–DC buck-boost converter is proposed for voltage regulation and power management. It combines the feature of multi-input and multi-output. The proposed converter consists of only one inductor, which reduces the number of active elements. A control circuit with a one-cycle control strategy is proposed to achieve this objective. A fixed ratio power management strategy is proposed for power management. The rising edge synchronization PWM method is realized as a suitable switching strategy for the converter. To design the compensator for the converter control system, a small signal model of the converter is developed. A PI controller is used to regulate the output voltage and the one cycle control (OCC) technique is used for current control. The operating characteristics of the proposed converters are validated by hardware results obtained from an Opal-RT real-time simulator.
-
Anukul Prasad Parhi,S. Sundar Kumar Iyer 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.2
The thin-film morphology and segregated phases of constituents in blends oforganic semiconductors play an important role in determining the performanceof devices fabricated with these constituents. In this study, we explored the effectof an external electric field applied during annealing on the morphology andphase of blended films of two popular organic semiconductors, copperpthalocyanine (CuPc) and buckminsterfullerene (C60). Films of different blendratios annealed at various temperatures in both the presence and absence of anelectric field were characterized using scanning electron microscopy (SEM), Xraydiffraction (XRD), and ultraviolet-visible (UV-vis) spectroscopy. Thecharacteristics of annealed pristine CuPc films were also included forcomparison. The observed changes in the properties of the blended filmsfollowing the annealing, including the abrupt phase segregation of the blendedconstituents in the films, are discussed. The polarizability of the molecules wascalculated using density functional theory (DFT) to explain the interaction,stacking, and segregation of the molecules in the blend. The results showed thatapplication of an electric field during annealing of the blended films is anadditional control parameter that can help tune the properties of the blended film.
-
Fracture energy and tension softening relation for nanomodified concrete
A. Ramachandra Murthy,P. Ganesh,S. Sundar Kumar,Nagesh R. Iyer 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.6
This paper presents the details of size independent fracture energy and bi-linear tension softening relation for nano modified high strength concrete. Nano silica in powder form has been used as partial replacement of cement by 2 wt%. Two popular methods, namely, simplified boundary effect method of Karihaloo et al. (2003) and RILEM (1985) fracture energy with P-δ tail correction have been employed for estimation of size independent fracture energy for nano modified high strength concrete (compressive strength ranges from 55 MPa to 72 MPa). It is found that both the methods gave nearly same values, which is an additional evidence that either of them can be employed for determination of size independent fracture energy. Bi-linear tension softening relation corresponding to their size independent fracture energy has been constructed in an inverse manner based on the concept of non-linear hinge from the load-crack mouth opening plots of notched three-point bend beams.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
