• Title/Summary/Keyword: Indoor photovoltaics

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Ethylenediamine Based Surface Defect Passivation for Enhancing Indoor Photovoltaic Efficiency of Perovskite (페로브스카이트 실내 광전변환 효율 향상을 위한 ethylenediamine 기반의 표면 결함 부동화 연구)

  • Seok Beom Kang;Joo Woong Yoon;Chang Yong Kim;Sangheon Lee;Hyemin Lee;Dong Hoe Kim
    • Current Photovoltaic Research
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    • v.11 no.3
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    • pp.87-95
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    • 2023
  • As the demand for the Internet of Things grows, research into indoor photovoltaics for wireless power is becoming important. In particular, perovskite has attracted considerable attention due to its superior performance compared to other candidates. However, various surface defects present in perovskite are a limiting factor for high performance. In particular, deep-level surface defects caused by uncoordinated Pb2+ ions directly limit charge transport. In low light environments, this appears to be a more significant hurdle. In this study, ethylenediamine, which can provide covalent bonding to uncoordinated Pb2+ ions through nitrogen, was used as a surface treatment material for indoor photovoltaics. X-ray photoelectron spectroscopy confirmed that the uncoordinated Pb2+ ions were effectively passivated by the terminal nitrogen of ethylenediamine. As a consequence, a VOC of 0.998 V, a JSC of 0.139 mA cm-2 and a fill factor of 83.03% were achieved, resulting in an indoor photoelectric conversion efficiency of 38.02%.

Morphology Control of Active Layers for Efficient Organic Indoor Photovoltaics (광활성층 모폴로지 제어를 통한 실내광 유기태양전지의 효율 향상 연구)

  • Yongchan Jang;Soyoung Kim;Jeonga Kim;Jongbok Kim;Wonho Lee
    • Journal of Adhesion and Interface
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    • v.23 no.4
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    • pp.130-136
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    • 2022
  • Recently, organic semiconductor based indoor photovoltaics have gained attention since they exhibit excellent photovoltaic performance than that of conventional Si-based photovoltaics. In this study, we synthesize the medium bandgap polymer of PTBT and optimize PTBT:PC71BM blend films by introducing solvent additives. To this end, we select DIO and CN solvent additives and vary their contents from 0 to 3 vol%. As a result, we produce the highest power conversion efficiency of 11.31% under LED 1000 lx conditions with DIO (1.5 vol%) + CN (0.5 vol%)

Micropower energy harvesting using high-efficiency indoor organic photovoltaics for self-powered sensor systems

  • Biswas, Swarup;Lee, Yongju;Kim, Hyeok
    • Journal of Sensor Science and Technology
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    • v.30 no.6
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    • pp.364-368
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    • 2021
  • We developed a highly efficient organic photovoltaic (OPV) cell with a poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl-C71-butyric acid methyl ester active layer for harvesting lower-intensity indoor light energy to power various self-powered sensor systems that require power in the microwatt range. In order to achieve higher power conversion efficiency (PCE), we first optimized the thickness of the active layer of the OPV cell through optical simulations. Next, we fabricated an OPV cell with optimized active layer thickness. The device exhibited a PCE of 12.23%, open circuit voltage of 0.66 V, short-circuit current density of 97.7 ㎂/cm2, and fill factor of 60.53%. Furthermore, the device showed a maximum power density of 45 ㎼/cm2, which is suitable for powering a low-power (microwatt range) sensor system.

Optical Simulation Study on Indoor Organic Photovoltaics with Textured Electrodes towards Self-powered Photodetector

  • Biswas, Swarup;Kim, Hyeok
    • Journal of Sensor Science and Technology
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    • v.28 no.4
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    • pp.236-239
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    • 2019
  • In this work, we performed an optical simulation study on the performance of a PMDPP3T:PCBM based on an organic photovoltaic (PV) device. The virtual PV device was developed in Lumerical, finite-difference time-domain (FDTD) solutions. Different layers of the PV cell have been defined through the incorporation of complex refractive index value of those layers' constituent materials. During the simulation study, the effect of the variation active layer thickness on an ideal short circuit current density ($J_{sc,ideal}$) of the PV cell has been, first, observed. Thereafter, we have investigated the impact of surface roughness of a transparent conducting oxide (TCO) electrode on $J_{sc,ideal}$ of the PV cells. From this simulation, it has been observed that the $J_{sc,ideal}$ value of the PV cell is strongly dependent on the thickness of its active layer and the photon absorption of the PV cell has gradually decreased with the increment of the TCO's surface roughness. As a result, the capability of the PV device has been reduced with the increment of the surface roughness of the TCO.