• Title/Summary/Keyword: Fill density

Search Result 240, Processing Time 0.03 seconds

The performance dependency of the organic based solar cells on the variation in InZnSnO thickness

  • Choi, Kwang-Hyuk;Jeong, Jin-A;Park, Yong-Seok;Park, Ho-Kyun;Kim, Han-Ki
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2010.02a
    • /
    • pp.268-268
    • /
    • 2010
  • The performance dependence of the P3HT:PCBM based bulk hetero-junction (BHJ) organic solar cells (OSCs) on the electrical and the optical properties of amorphous InZnSnO (a-IZTO) electrodes as a difference in film thicknesses are examined. With an increasing of the a-IZTO thickness, the series resistance ($R_{series}$) of the OSCs is reduced because of the reduction of sheet resistance ($R_{sheet}$) of a-IZTO electrodes. Additionally, It was found that the photocurrent density ($J_{sc}$) and the fill factor (FF) in OSCs are mainly affected by the electrical conductivity of the a-IZTO anode films rather than the optical transparency at thinner a-IZTO films. On the other hand, despite the much lower $R_{series}$ comes from thicker anode films, the dominant factor affecting the $J_{sc}$ became average optical transmittance of a-IZTO electrodes as well as power conversion efficiency (PCE) in same device configuration due to the thick anode films had as sufficiently low $R_{sheet}$ to extract the hole carrier from the active material.

  • PDF

Evaluation of Compaction Properties of Subgrade Soil by Gyratory Compaction Curve (선회다짐곡선특성을 이용한 노상토의 다짐도 평가)

  • Lee, Kwan-Ho;Cha, Min-Kyung;Lim, Yu-Jin
    • Journal of the Korean Society of Hazard Mitigation
    • /
    • v.9 no.1
    • /
    • pp.33-40
    • /
    • 2009
  • Compacted soil are used in almost roadway construction with compaction of soil. The direct consequence of soil compaction is densification, which in turn results in higher strength, lower compressibility, and lower permeability. The standard and modified Proctor tests are the most common methods. Both of these tests utilize impact compaction, although impact compaction shows no resemblance to any type of field compaction and is ineffective for granular soils. It has been dramatic advances in field compaction equipment. Therefore, the Proctor tests no longer represent the maximum achievable field density. The main objectives of this research are a survey of current field compaction equipment, laboratory investigation of compaction characteristics, and field study of compaction characteristics. The findings from the laboratory and compaction program were used to establish preliminary guidelines for suitable laboratory compaction procedures.

High-performance photovoltaics by double-charge transporters using graphenic nanosheets and triisopropylsilylethynyl/naphthothiadiazole moieties

  • Agbolaghi, Samira;Aghapour, Sahar;Charoughchi, Somaiyeh;Abbasi, Farhang;Sarvari, Raana
    • Journal of Industrial and Engineering Chemistry
    • /
    • v.68
    • /
    • pp.293-300
    • /
    • 2018
  • Reduced graphene oxide (rGO) nanosheets were patterned with poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) and poly[bis(triiso-propylsilylethynyl) benzodithiophene-bis(decyltetradecyl-thien) naphthobisthiadiazole] (PBDT-TIPS-DTNT-DT) and used in photovoltaics. Conductive patternings changed via surface modification of rGO; because polymers encountered a high hindrance while assembling onto grafted rGO. The best records were detected in indium tin oxide (ITO):poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS):PBDTDTNT/rGO:PBDT-DTNT:LiF:Al devices, i.e., short current density $(J_{sc})=11.18mA/cm^2$, open circuit voltage $(V_{oc})=0.67V$, fill factor (FF) = 62% and power conversion efficiency (PCE) = 4.64%. PCE increased 2.31 folds after incorporation of PBDT-DTNT into thin films. Larger polymer assemblies on bared-rGO nanosheets resulted in greater phase separations.

The Effect of PEDOT:PSS Thickness on the Characteristics of Organic-Inorganic Hybrid Solar Cells (PEDOT:PSS의 두께가 유무기 하이브리드 태양전지 성능에 미치는 영향)

  • Kim, Souk Yoon;Han, Joo Won;Oh, Joon-Ho;Kim, Yong Hyun
    • Current Photovoltaic Research
    • /
    • v.7 no.3
    • /
    • pp.61-64
    • /
    • 2019
  • In this study, we investigate organic-inorganic hybrid solar cells with a very simple three-layer structure (Al/n-Si/PEDOT:PSS). The performance of hybrid solar cells is optimized by controlling the sheet resistance and optical transmittance of the PEDOT:PSS layers. As the thickness of the PEDOT:PSS layer decreases, the optical absorption of the n-Si increases, which greatly improves the short-circuit current density ($J_{SC}$) of devices, but the increase in sheet resistance leads to a decrease in the open-circuit voltage ($V_{OC}$) and the fill factor (FF). The solar cell with the 180-nm thick PEDOT:PSS layer shows a highest efficiency of 8.45% ($V_{OC}$: 0.435 V, $J_{SC}$: $33.7mA/cm^2$, FF: 57.5%). Considering these results, it is expected that the optimizing process for the sheet resistance and transmittance of the PEDOT:PSS layer is essential for producing high-efficiency organic-inorganic hybrid solar cells and will serve as an important basis for achieving low-cost, high-efficiency solar cells.

Electrode Design for Electrode Formation and PV Module Integration Development (전극형성과 태양전지 모듈 일체화 기술 개발에 적용되는 태양전지 전극 설계 기술)

  • Park, Jinjoo;Jeon, Youngwoo;Jang, Minkyu;Kim, Minje;Lim, Donggun
    • Current Photovoltaic Research
    • /
    • v.9 no.4
    • /
    • pp.123-127
    • /
    • 2021
  • This study was on electrode design for the realization of a solar cell that combines electrode formation and module integration process to overcome printing limitations. We used the passivated emitter rear contact (PERC) solar cell. Wafer size was 156.75 mm ×156.75 mm. The fabricated cell results showed that the open-circuit voltage of 649 mV, short-circuit current density of 36.15 mA/cm2, fill factor of 68.5%, and efficiency of 16.06% with electrode conditions the 24BBs with the width 190 ㎛ and 90FBs with the width 45 ㎛. For improving efficiency, the characteristics of the solar cell were checked according to the change in the number of BBs and FBs and the change in line fine width. It is confirmed that the efficiency of the solar cell will be improved by increasing the number of FBs from 90 to 120, and increasing the line width of the FBs by about 10 ㎛ compared to the manufacturing solar cells.

Impact of Cyano and Fluorine Group Functionalization on the Optoelectronic and Photovoltaic Properties of Donor-Acceptor-π-Acceptor Benzothiadiazole Derived Small Molecules: A DFT and TD-DFT Study

  • Prabhat Gautam;Anurag Gautam;Neeraj Kumar
    • Korean Journal of Materials Research
    • /
    • v.33 no.6
    • /
    • pp.236-241
    • /
    • 2023
  • Solar cells based on p-conjugated donor-acceptor (D-A) organic molecular systems are a promising alternative to conventional electrical energy generation. D-A molecular systems, which have a triphenylamine (TPA) moiety linked with a benzothiadiazole (BTD) moiety, open the potential development of new small molecule donors for bulk heterojunction (BHJ) solar cells. Here, a series of donor-acceptor-π-acceptor (D-A-π-A) small molecule donors (SMD) derived from triphenylamine (TPA) donor and benzothiadiazole (BTD) acceptor building blocks, were designed for BHJ organic solar cells. The small molecule donors SMD1-4 were studied using density functional theory (DFT) and time dependent-DFT (TDDFT) methods, to understand the effect of cyano and fluorine group functionalization on their properties. The effect of structure alteration by cyano and fluorine group functionalization on the optoelectronic properties, the calculated highest occupied molecular orbitals (HOMOs) and lowest unoccupied molecular orbitals (LUMOs) and the HOMO-LUMO gaps were theoretically explored. The Voc (open-circuit photovoltage) and fill factor (FF) for SMD1-4 were obtained with a PC71BM acceptor, which showed that these organic small molecules are potential small molecule donors for organic bulk heterojunction solar cells.

Long-Term Performance of Amorphous Silicon Solar Cells with Stretched Exponential Defect Kinetics and AMPS-1D Simulation (비정질실리콘 태양전지에 대한 장시간 성능예측: 확장지수함수 모형 및 컴퓨터 모의실험)

  • Park, S.H.;Lyou, Jong-H.
    • Journal of the Korean Vacuum Society
    • /
    • v.21 no.4
    • /
    • pp.219-224
    • /
    • 2012
  • We study for long-term performance of amorphous silicon solar cells under light exposure. The performance is predicted with a kinetic model in which the carrier lifetimes are determined by the defect density. In particular, the kinetic model is described by the stretched-exponential relaxation of defects to reach equilibrium. In this report, we simulate the light-induced degradation of the amorphous silicon solar cells with the kinetic model and AMPS-1D computer program. And data measured for outdoor performances of various solar cells are compared with the simulated results. This study focuses on examining the light-induced degradation for the following amorphous silicon pin solar cells: thickness${\approx}$300 nm, built-in potential${\approx}$1.05 V, defect density (at t=0)${\approx}5{\times}10^{15}cm^{-3}$, short-circuit current density (at t=0)${\approx}15.8mA/cm^2$, fill factor (at t=0)${\approx}0.691$, open-circuit voltage (at t=0)${\approx}0.865V$, conversion efficiency (at t=0)${\approx}9.50%$.

Synthesis and Photovoltaic Properties of Low Band Gap π-Cojugated Polymer Based on 4,7-Di-thiophen-2-yl-benzo[1,2,5]thiadiazole (4,7-Di-thiophen-2-yl-benzo[1,2,5]thiadiazole을 기본으로 한 고분자의 합성 및 광전변환 특성)

  • Shin, Woong;You, Hyeri;Park, Jeong Bae;Park, Sang Jun;Jeong, Mi Seon;Moon, Myung-Jun;Kim, Joo Hyun
    • Applied Chemistry for Engineering
    • /
    • v.21 no.2
    • /
    • pp.137-141
    • /
    • 2010
  • Poly [4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole]-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene (PPVTBT) was synthesized by the Heck coupling reaction between 4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole and 1,4-bis(dodecyloxy)-2,5-divinylbenzene. The maximum absorption and band gap of PPVTBT were 550 nm and 1.74 eV, respectively. The HOMO and LUMO energy level of PPVTBT were -5.24 eV and -3.50 eV, respectively. The photovoltaic device based on the blend of PPVTBT and (6)-1-(3-(methoxycarbonyl)propyl)-{5}-1-phenyl[5,6]-$C_{61}$ (PCBM) (1 : 6 by weight ratio) was fabricated. The efficiency of device was 0.16%. The short circuit current density (Jsc), fill factor (FF) and open-circuit voltage (Voc) of the device was $0.74mA/cm^{2}$, 31% and 0.71 V, respectively, under AM 1.5 G and 1 sun condition ($100mA/cm^{2}$).

Performance Characteristics of p-i-n type Organic Thin-film Photovoltaic Cell with Rubrene:CuPc Hole Transport Layer (Rubrene:CuPc 정공 수송층이 도입된 p-i-n형 유기 박막 태양전지의 성능 특성 연구)

  • Kang, Hak-su;Hwang, Jongwon;Kang, Yongsu;Lee, Hyehyun;Choe, Youngson
    • Korean Chemical Engineering Research
    • /
    • v.48 no.5
    • /
    • pp.654-659
    • /
    • 2010
  • We have investigated the effect of rubrene-doped CuPc hole transport layer on the performance of p-i-n type bulk hetero-junction photovoltaic device with a structure of ITO/PEDOT:PSS/CuPc: rubrene/CuPc:C60(blending ratio 1:1)/C60/BCP/Al and have evaluated the current density-voltage(J-V) characteristics, short-circuit current($J_{sc}$), open-circuit voltage($V_{oc}$), fill factor(FF), and energy conversion efficiency(${\eta}_e$) of the device. By rubrene doping into CuPc hole transport layer, absorption intensity in absorption spectra decreased. However, the performance of p-i-n organic type bulk hetero-junction photovoltaic device fabricated with crystalline rubrene-doped CuPc was improved since rubrene shows higher bandgap and hole mobility compared to CuPc. Increased injection currents have effected on the performance improvement of the present device with energy conversion efficiency(${\eta}_e$) of 1.41%, which is still lower value compared to silicone solar cell and many efforts should be made to improve organic photovoltaic devices.

The Development of Steel-plate Concrete Panels with Preplaced Lightweight Aggregates Concrete (프리플레이스트 경량골재 콘크리트를 사용한 합성형 구조모듈 제작 및 성능 평가)

  • Yoon, Jin Young;Kim, Jae Hong
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.5 no.1
    • /
    • pp.21-28
    • /
    • 2017
  • The steel-plate concrete(SC) is used in a form of module assembly construction in the outer wall of nuclear-power plant and LNG containment. Since the steel-plate concrete modules are generally manufactured from the plant, the weight of SC has significantly effect on the total construction cost in the aspect of shipment. Therefore, the use of lightweight aggregates concrete(LWAC), which fill the inside of SC module can be a solution. However, the amount of used lightweight aggregates(LWA) is limited in the use of current concrete mixing process due to the concrete quality problems and it also determines the allowable minimum density of LWAC. In this research, the preplaced casting method is applied because of increasing the volume fraction of LWA significantly, which results from the producing process of pre-packing the LWA in the formwork and filling the interstitial voids between LWA using cement paste grout. The density and compressive strength of selected preplaced LWAC were $1,600kg/m^3$ and 30MPa and it was applied for the mock-up specimens of SC panel. It was used for the 3-point bending test for evaluating its structural performance. The results show that the preplaced LWAC can reduce the density of concrete with the adequate mechanical and structural performance.