Understanding Energy Loss in Organic Solar Cells: Toward a New Efficiency Regime

Menke, S. Matthew; Ran, Niva A.; Bazan, Guillermo C.; Friend, Richard H.

doi:10.1016/j.joule.2017.09.020

Cited by 493 publications

(438 citation statements)

References 65 publications

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“…On the contrary, the V OC of P2 ternary system hardly changes with the content of NCBDT‐4Cl, which could be correlated with the cascade structure model (see Tables S1 and S2 in the Supporting Information). [ 21,53–56 ] Obviously, the P1 and P2 binary PSCs exhibit comparable device performance and P2:LA1 even shows a higher PCE than P1:LA1, which indicates that biphenyl side group could be a good candidate for constructing high performance binary PSC than phenyl side group. However, distinct device performance of P1 and P2 based ternary PSCs were observed, which could be attributed to the disturbed micromorphology induced by the extended entanglement of polymer chains.…”

Section: Resultsmentioning

confidence: 99%

Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Jiang

Wang

et al. 2020

Advanced Science

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Ternary strategy is a promising approach to broaden the photoresponse of polymer solar cells (PSCs) by adopting combinatory photoactive blends. However, it could lead to a more complicated situation in manipulating the bulk morphology. Achieving an ideal morphology that enhances the charge transport and light absorption simultaneously is an essential avenue to promote the device performance. Herein, two polymers with different lengths of side groups (P1 is based on phenyl side group and P2 is based on biphenyl side group) are adopted in the dual‐acceptor ternary systems to evaluate the relationship between conjugated side group and crystalline behavior in the ternary system. The P1 ternary system delivers a greatly improved power conversion efficiency (PCE) of 13.06%, which could be attributed to the intense and broad photoresponse and improved charge transport originating from the improved crystallinity. Inversely, the P2 ternary device only exhibits a poor PCE of 8.97%, where the decreased device performance could mainly be ascribed to the disturbed molecular stacking of the components originating from the overlong conjugated side group. The results demonstrate a conjugated side group could greatly determine the device performance by tuning the crystallinity of components in ternary systems.

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Section: Resultsmentioning

confidence: 99%

Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Jiang

Wang

et al. 2020

Advanced Science

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“…Efficient charge separation is encouraged by having a small energetic offset (≈0.3 eV) between the LUMO of the ED and EA (Δ E LUMO in Figure a) and between HOMO of EA and ED (Δ E HOMO in Figure a). Conversely, some recent reports indicate that the HOMO/LUMO offset might not be necessary for FREA‐based OSCs and may also reduce charge transfer energy losses …”

Section: Osc Parameters and Architecturementioning

confidence: 94%

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

Small

139

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The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement from ≈2.5% in 2013 to 17.3% in 2018 in OSC performance is primarily credited to novel nonfullerene acceptors (NFA), especially fused ring electron acceptors (FREAs). FREAs offer unique advantages over FAs, like broad absorption of solar radiation, and they can be extensively chemically manipulated to tune optoelectronic and morphological properties. Herein, the current status in FREA‐based OSCs is summarized, such as design strategies for both wide and narrow bandgap FREAs for BHJ, all‐small‐molecule OSCs, semi‐transparent OSC, ternary, and tandem solar cells. The photovoltaics parameters for FREAs are summarized and discussed. The focus is on the various FREA structures and their role in optical and morphological tuning. Besides, the advantages and drawbacks of both FAs and NFAs are discussed. Finally, an outlook in the field of FREA‐OSCs for future material design and challenges ahead is provided.

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“…At present solar cell, several models are studied extensively for their prospective applications . Lot of design complexity and rich processes patch marks some technologies less attractive .…”

Section: Introductionmentioning

confidence: 99%

“…The thermal effect on activation energy that eventually marks variation in electrical conduction properties in ESC. Organic or polymer low electrical conductivity possibly leads to choices of diverse IEMs to carrier extraction and conduction . Opposite, high electrical and low thermal conductive trend is obvious in PSC .…”

Section: Introductionmentioning

confidence: 99%

“…Energy conversion route, greater EP ropes to hot CT state for optical gain that ultimately enhances stability and efficiency of PSC and OSC . Advanced IEM band edge, EP, and greater conduction supports to enrich V oc and minimizes instability . Hence, OSC and PSC optical to electrical energy transfer track loss is sensibly linked to the active‐interface materials, its architecture and functional properties .…”

Section: Introductionmentioning

confidence: 99%

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Emerging solar cells energy trade-off: Interface engineering materials impact on stability and efficiency progress

Ghosh

Biswas

2018

Int J Energy Res

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Summary Emerging solar cell (ESC) carrier's dynamic transfer difficulties and instability at dissimilar material's interface seems to be potential distress. Electrical permittivity influences on photo carrier dynamics of nonpolarized organic and polarized organic‐inorganic perovskite solar cell. ESC electrical efficiency and stability are consider to be managed broadly by carrier accumulation, extraction, and conduction techniques. Active materials optoelectric interaction and carrier accumulation are petite known. Its energetic dealings with dissimilar interface materials how support to faster carrier extraction and conduction are still in haze. In this drill, focus on active to interface materials key properties are imperative to find a way to promote electrical energy conversion and its steadiness. Selected advanced interface engineering materials (IEMs) architectures, conduction, and multifarious relations to active materials for efficient energy transfer ability and stability are reported precisely by the model. The interface structure consistency supports to systematize energy transfer, otherwise, disorder or energy loss is anticipated. Therefore, active material linkage to IEM photophysical, quantum, and choice of materials technologies are focused comprehensively to explore the pathway of ESC stability and efficiency progression.

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Understanding Energy Loss in Organic Solar Cells: Toward a New Efficiency Regime

Cited by 493 publications

References 65 publications

Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Emerging solar cells energy trade-off: Interface engineering materials impact on stability and efficiency progress

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