Indoor light recycling: a new home for organic photovoltaics

Cutting, C L; Bag, Monojit; Venkataraman, D.

doi:10.1039/c6tc03344j

Cited by 176 publications

(151 citation statements)

References 23 publications

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“…After the electron acceptor was replaced by ICBA, the values of V oc increased; for example, to 0.77 V at 500 lux – a lighting level typical of heavily used offices . We attribute the higher value of V oc and larger PCE to the higher energy level of the lowest unoccupied molecular orbital (LUMO) of ICBA (Figure ), thereby minimizing energy loss upon exciton separation at the donor–acceptor interfaces.…”

Section: Resultsmentioning

confidence: 97%

“…The first is the light intensity. The power intensity of the AM1.5G standard is 100 mW cm −2 ; the intensity of the indoor lighting sources typically ranges from 0.5 to 1 mW cm −2 – that is, a factor 100–500 lower . Accordingly, the photovoltaic devices would display much lower power output under indoor conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Among these technologies, photovoltaic energy has great promise because of its high energy density and relatively high output voltage . In particular, several emerging photovoltaic technologies, including organic photovoltaics (OPVs), dye‐sensitized solar cells (DSSCs) and organic/inorganic hybrid perovskite solar cells, might become efficient energy sources for harvesting low‐level lighting. In 2015, Mori et al studied the performance of OPV devices under irradiation with light‐emitting diodes (LEDs) and compared the device parameters with those of crystal silicon solar cells.…”

Section: Introductionmentioning

confidence: 99%

“…They predicted that a power conversion efficiency (PCE) of 21.3% could be obtained under daylight color LED illumination . More recently, Cutting et al reported that OPV devices, which exhibited PCEs much lower than those of Si solar cells when measured under the conventional AM1.5G standard, could surpass Si cells – with higher measured PCEs – under LED illumination . Considering their many other attractive properties (e.g., light weight, flexibility, low cost), OPVs have great potential to open up a variety of new indoor or low‐level lighting applications that have not been possible when using Si solar cells.…”

Section: Introductionmentioning

confidence: 99%

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Toward High‐Performance Polymer Photovoltaic Devices for Low‐Power Indoor Applications

et al. 2017

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This article describes the performance of organic photovoltaic (OPV) devices, incorporating three different polymer/fullerene derivative blends, under low‐level lighting conditions. The devices exhibit much higher power conversion efficiencies (PCEs) under indoor lighting conditions than they do under sunlight. The best‐performing device is capable of delivering a power output of 22.57 μW cm−2, corresponding to a PCE of 13.76%, under illumination with indoor lighting conditions at 500 lux. Increasing the open‐circuit voltage (Voc) of the OPV devices is the most critical factor for achieving high device performance for low‐power indoor applications. Therefore, the device power output will be maximized if we could obtain a larger energy difference between the highest occupied molecular orbital of the polymer donor and the lowest unoccupied molecular orbital of the electron acceptor, thereby ensuring a high value of Voc.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toward High‐Performance Polymer Photovoltaic Devices for Low‐Power Indoor Applications

et al. 2017

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“…A large HIB lowers the internal potential of the device and increases the V OC drop and carrier recombination. [84,85] The devices containing only HTL Solar showed a marked difference in slopes when pre-exposed to the LED lamp and Xe lamp due to deficient internal potential with large HIB. The devices were pre-exposed during 30 min individually using a warm white LED lamp and Xe lamp, and then measured under Xe lamp at 1 sun (100 mW cm −2 ) for analysis of internal potential shift.…”

Section: Energy Level Matching and Internal Potential Of Htlsmentioning

confidence: 99%

Evaporation‐Free Nonfullerene Flexible Organic Solar Cell Modules Manufactured by An All‐Solution Process

Han

Jeon

Lee

et al. 2019

Advanced Energy Materials

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fabricated for application over a large area, and applicability in flexible electronics. [1][2][3][4][5][6] It is possible to design high-performance devices by designing photoactive materials that constitute a bulk heterojunction (BHJ), [7][8][9] device engineering, [10][11][12][13] and a combination of these. [14,15] Therefore, this has attention as an area in which commercialization can occur through the application of flexible, wearable, and portable devices, and building-integrated photovoltaics. [4,[16][17][18][19][20] Recently, different methods such as spin coating, [21][22][23] slotdie coating, [24][25][26] and blade coating, [27,28] are being attempted to develop large-area modules with laboratory-to-industrial applications. Among them, slot-die coating can easily control each layer and the related processing factors, such as discharge rate and speed, thus enabling control of thickness and conformation. Therefore, it is the most appropriate coating method to use to produce devices and modules with large areas. [16,29] Krebs and co-workers fabricated flexible OSC modules using a roll-to-roll (R2R) manufacturing process called "ProcessOne." Their flexible OSC modules with power conversion efficiencies (PCEs) of 2-3% demonstrated an energy payback time (EPBT) of 2.02-1.35 years. [30,31] Using Proces-sOne, the BHJ layer and buffer layer were formed using slot-die coating and the Ag back electrode was formed via screen printing; this resulted in the design of OSC modules with inverted structures, which enabled cost-effective production. [32,33] Several particular challenges need to be considered in the manufacturing of this type of OSC modules using an R2R process; these included thermally treating the film [34,35] and ensuring the thermal stability of the substrate [36] the uniformity of the film morphology, [22][23][24] and the evaporation process of the buffer layer and the electrode. [3,25,26,37] The large-area flexible OSC modules have been reported their efficiencies with various materials and coating methods. In flexible unit-cells with small-area, Peng and co-workers recently reported high PCE of 14.06% introducing ternary heterojunction strategy in active area of 0.04 cm 2 . [38] The flexible OSC module based thermally evaporated top electrode reported relatively higher performances. Zhou and co-workers reported tandem structure with PCE of 6.5% in active area of 10.5 cm 2 , also, Ma and co-workers reported ternary structure with PCE of To ensure laboratory-to-industry transfer of next-generation energy harvesting organic solar cells (OSCs), it is necessary to develop flexible OSC modules that can be produced on a continuous roll-to-roll basis and to apply an allsolution process. In this study, nonfullerene acceptors (NFAs)-based donor polymer, SMD2, is newly designed and synthesized to continuously fabricate high-performance flexible OSC modules. Also, multifunctional hole transport layers (HTLs), WO 3 /HTL solar bilayer HTLs, are developed and applied via an all-solution process called "ProcessOne...

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