Characteristics of PTB7:C70 bulk heterojunction photocell prepared with halogen-free solvent at low light illumination

Tada, Kazuya

doi:10.1007/s00289-016-1667-6

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…]thienophenediyl] (PTB7) as the absorber combined with [6,6] -phenyl C70 butyric acid methyl ester (PC 70 BM) as an electron acceptor for conventional configuration devices [4,5]. Recently, inverted structured OSCs with electron accepting fullerene and the electron donating polymer as the active layer have drawn great interest because of the inherent device stability and enhanced performance [6][7].…”

Section: Introductionmentioning

confidence: 99%

Inverted organic solar cells based on PTB7:PC70BM bulk heterojunction

Sharma

Negi

Yadav

et al. 2019

AIP Conference Proceedings

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This paper reports the fabrication and characterization of bulk heterojunction inverted structured organic solar cell devices (OSC) with the architecture of ITO/ZnO/PTB7:PC 70 BM/MoO3/Ag. The photovoltaic properties of OSC were examined through the analysis of various photovoltaic parameters, which includes the external quantum efficiency, short circuit current density (J sc ), and open circuit voltage (V oc ). The inverted structured OSC device showed the efficiency of 5.87 %. The achieved efficiency can be attributed to the better light harvesting capability, improved interfacial properties and improved charge collection efficiency. The AC impedance technique was employed to extract internal parameters of the fabricated devices. The obtained impedance curves evidently exhibit high-quality correlation between the obtained data and the curve fitting data.

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Section: Introductionmentioning

confidence: 99%

Inverted organic solar cells based on PTB7:PC70BM bulk heterojunction

Sharma

Negi

Yadav

et al. 2019

AIP Conference Proceedings

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“…For this purpose, the characterization, as well as the development of suitable circuit model of a photocell under low‐light illumination, is essential. Recent studies have shown that polymer photocells are promising for indoor light harvesting .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of PTB7‐Th:C bulk heterojunction photocells under low‐light illumination: Critical effect of dark parallel resistance

Tada

2017

Physica Status Solidi (a)

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Solution-processed organic photocell is one of the most promising candidates for the permanent power source for wireless devices. Since the device is not necessarily to be placed outdoor, and indoor light is generally weaker than outdoor light by 2-3 orders of magnitude, the characterization of the photocell under low-light illumination is important for this purpose. In this study, bulk heterojunction photocells based on a lowenergy gap polymer poly [[4,8-bis[5-(2-ethylhexyl) [3,4-b]thiophenediyl]] (PTB7-Th) as well as unmodified C 70 prepared with a halogen-free solvent 1,2,4-trimethylbenzene, are characterized under low-light illumination. The combination of a halogen-free solvent with an unmodified fullerene potentially provides a way to develop environmentally friendly organic photocells. It is found that the photocells show higher power conversion efficiency (PCE) under lower light illumination intensity. That is, a device showing PCE of 4.9% under 1 sun illumination shows PCE over 9% at 3' 10 −4 sun. A sublinear dependence of the short-circuit photocurrent to the light intensity, as well as the increased fill-factor at reduced illumination, is found to be a key to the high PCE at low-light. The latter originates from the photoconduction in the composite. The critical effect of dark parallel resistance on the low-light performance of the photocells is also demonstrated.1 Introduction Photocells based on bulk heterojunction composites consisting of conjugated polymers and fullerenes are attracting much interest of the researchers, partly because the compatibility with low-temperature solution-based process makes them promising candidates for large-area low-cost renewable energy source in the near future [1][2][3][4]. The development of conjugated polymers such as poly [[4,8-bis[(2ethylhexyl)oxy]benzo [1,2-b:4,5-b ]dithiophene-2,6-diyl][3fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) and poly[[4,8-bis[5-(2-ethylhexyl) thiophene-2yl]benzo[1,2-b:4,5-b'f]dithiophene-2,6-diyl][3-fluoro-2-[(2ethylhexyl)carbonyl]thieno [3,4-b]thiophenediyl]] (PTB7-Th) is pushing up the performance of this class of photocells [5,6].The use of highly soluble fullerene derivatives such as [6,6]-phenyl-C 71 -butyric acid methyl ester (C 70 -PCBM), as

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