Flexible Organic Solar Cells for Scalable, Low‐Cost Photovoltaic Energy Conversion

Yoo, Seunghyup; Lee, Dong Kun; Han, Dongil; Kim, Hoyeon

doi:10.1002/9783527679973.ch16

Cited by 3 publications

(4 citation statements)

References 93 publications

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“…The work function of PEDOT:PSS is measured by Kelvin probe and equals to 5.01 ± 0.07 eV, which leads to a built-in potential of 0.9 V with reference to ITO/PEIE bottom electrode and a barrier of 1.3 eV with regard to the LUMO level of PC 60 BM. We specifically selected the PC 60 BM instead of PC 70 BM to reduce the dark current since the electron injection barrier is larger (1.3 eV vs. 0.7 eV)34. Photodetectors with PC 70 BM for similar thickness and bias have reported dark currents reported slightly higher1112.…”

Section: Resultsmentioning

confidence: 99%

Long-Term Stable Organic Photodetectors with Ultra Low Dark Currents for High Detectivity Applications

Kielar

Dhez²,

Pécastaings

et al. 2016

Sci Rep

202

219

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Printed organic photodetectors can transform plastic, paper or glass into smart surfaces. This innovative technology is now growing exponentially due to the strong demand in human-machine interfaces. To date, only niche markets are targeted since organic sensors still present reduced performances in comparison with their inorganic counterparts. Here we demonstrate that it is possible to engineer a state-of-the-art organic photodetector approaching the performances of Si-based photodiodes in terms of dark current, responsivity and detectivity. Only three solution-processed layers and two low-temperature annealing steps are needed to achieve the performance that is significantly better than most of the organic photodetectors reported so far. We also perform a long-term ageing study. Lifetimes of over 14,000 hours under continuous operation are more than promising and demonstrate that organic photodetectors can reach a competitive level of stability for successful commercialization of this new and promising technology.

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Section: Resultsmentioning

confidence: 99%

Long-Term Stable Organic Photodetectors with Ultra Low Dark Currents for High Detectivity Applications

Kielar

Dhez²,

Pécastaings

et al. 2016

Sci Rep

202

219

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“…polymers and polymer-based composites) show some advantages such as tuneable properties, lower production and deposition cost and the application on flexible device. 30 Nevertheless, they usually have relatively lower barrier properties in most cases not below 1 g m -Therefore, the development of a low-cost, effective, light weight and easily scalable encapsulant is a crucial, still unsolved, point for the forthcoming commercialization of PSCs. [33][34][35][36] Scientists have mainly focused their attention on encapsulant materials with barrier properties reaching or exceeding 10 -5 and 10 -3 for WVTR and OTR, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Choi and co-workers used ALD to deposit a 50 nm-thick layer of Al 2 O 3 with good barrier properties (WVTR = 1.8 10 –2 g m –2 day –1 ). , Compared to inorganic encapsulant materials and related deposition processes, organic counterparts ( i.e. , polymers and polymer-based composites) show some advantages such as tunable properties, lower production and deposition cost, and application on flexible devices . Nevertheless, they usually have relatively lower barrier properties, in most cases, not below 1 g m –2 day –1 , if referred to a single polymeric material .…”

Section: Introductionmentioning

confidence: 99%

“…28,29 Compared to inorganic encapsulant materials and related deposition processes, organic counterparts (i.e., polymers and polymer-based composites) show some advantages such as tunable properties, lower production and deposition cost, and application on flexible devices. 30 Nevertheless, they usually have relatively lower barrier properties, in most cases, not below 1 g m −2 day −1 , if referred to a single polymeric material. 21 Composite encapsulants, i.e., organic−inorganic mixed films, 31 could be also employed, but their synthesis is usually more expensive.…”

Section: Introductionmentioning

confidence: 99%

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Thermosetting Polyurethane Resins as Low-Cost, Easily Scalable, and Effective Oxygen and Moisture Barriers for Perovskite Solar Cells

Bonomo

Taheri

Bonandini

et al. 2020

ACS Appl. Mater. Interfaces

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Long-term stability of Perovskite Solar Cells (PSCs) is one of the main issues to be solved for a forthcoming commercialization of this technology. In this work, thermosetting polyurethane-based resins (PU) are proposed as effective encapsulants for Perovskite Solar Cells to prevent degradation caused by both moisture and oxygen. Application consists in a direct dropcast of precursor mixture onto the back of the device followed by in-situ polymerization, avoiding the use of other adhesives. PU are cost effective, lightweight, thermal and light-stable materials whose mechanical, chemical and physical properties can be easily tuned by thoughtful choice of their precursor. Encapsulated PSCs show extremely good stability when stored under ambient light (maximum 1000 lux) controlled humidity (28-65%) and temperature (18-30 °C) by retaining 94% of the initial power conversion efficiency after 2500 hours (4 months) whereas control devices lose 90% of their performance after 500 hours (T80 = 37 h); once stored according to ISOS-D-1 PU-protected devices showed T80 > 1200 h.. Encapsulated devices are stable even when immersed in pure water. Throughout this paper, it is demonstrated the use of PU as promising solution processed encapsulant materials for PSC, which can be a cost-effective route for future industrialization of this technology.

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Trace Solvent Additives Enhance Charge Generation in Layer‐by‐Layer Coated Organic Solar Cells

et al. 2022

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Organic solar cells (OSCs) offer lightweight, flexibility, semi-transparency, and low manufacturing costs all in one PV technology. [1] Over the past few years, the power conversion efficiency (PCE) of OSCs has increased significantly, recently exceeding 19%, bringing this technology closer to wide-scale commercial applications. [2] The improvement in PCE is driven by the continuous development of novel materials, particularly novel non-fullerene acceptors (NFAs). [3] Commonly, highly efficient OSC devices are prepared by blending donor and acceptor materials in solution, creating a so-called bulk-heterojunction (BHJ) photoactive layer upon deposition by, for instance, spin-coating, blading, or ink-jetting. [4] The BHJ exhibits a large donor/acceptor interface area, which ensures efficient exciton quenching and charge separation as well as an interpenetrating donor-acceptor (D-A) 3D network facilitating charge carrier percolation. [5] Large D-A domain sizes of 20-50 nm are often observed in high-efficiency NFA-based BHJ cells, [6] consistent with the reported long exciton diffusion length of NFAs. [7] However, obtaining the optimal nanoscale morphology of the BHJ photoactive layer consisting of interpenetrating bicontinuous D-A networks is challenging since it is very sensitive to material properties and processing conditions. [8] Nonoptimal D-A morphologies limit charge separation and transport and thus the device performance. [9] Alternatively, bilayer structures devices are prepared by sequential deposition of the individual donor and acceptor materials. [10] In fact, layer-by-layer (LbL) coated OSCs have recently gained attention due to improved charge transport and extraction, reduced dependence of their performance on the D/A ratio and solvent used in the processing step, and often better thermal stability. [10,11] The OSC solutions and the LbL processing conditions are selected such that a pseudo-bilayer configuration is obtained, where in the center of the photoactive layer an intermixed D/A layer is created, sandwiched between the neat D and A layers. [11c,11f] Using this approach, Sun et al. achieved an impressive performance of LbL-coated OSCs based on the high-efficiency PM6:Y6 system with a PCE of %16.4%, even higher than obtained for BHJ devices (15.4%). [11a] The versatility

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Flexible Organic Solar Cells for Scalable, Low‐Cost Photovoltaic Energy Conversion

Cited by 3 publications

References 93 publications

Long-Term Stable Organic Photodetectors with Ultra Low Dark Currents for High Detectivity Applications

Long-Term Stable Organic Photodetectors with Ultra Low Dark Currents for High Detectivity Applications

Thermosetting Polyurethane Resins as Low-Cost, Easily Scalable, and Effective Oxygen and Moisture Barriers for Perovskite Solar Cells

Trace Solvent Additives Enhance Charge Generation in Layer‐by‐Layer Coated Organic Solar Cells

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