Selenopheno[3,2-<i>b</i>]thiophene-Based Narrow-Bandgap Nonfullerene Acceptor Enabling 13.3% Efficiency for Organic Solar Cells with Thickness-Insensitive Feature

Wang, Jinliang; Liu, Kaikai; Lei, Hong; Ge, Gaoyang; Zhang, Chao; Hou, Jianhui

doi:10.1021/acsenergylett.8b01808

Cited by 145 publications

(104 citation statements)

References 70 publications

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“…possessing near-infrared (NIR) absorption, since extending absorption to NIR region can obtain relatively high current density for high efficiency limits. [1][2][3][4][5][6][7][8][9][10][11] At present, power conversion efficiencies (PCEs) above 16% and 17% have been achieved for single-junction and tandem OSCs, respectively. [12][13][14][15][16] Though that, much more efforts are still required to catch up with the performances of perovskite solar cells or silicon solar cells.…”

Section: Doi: 101002/smtd201900531mentioning

confidence: 99%

Near‐Infrared Nonfullerene Acceptors Based on Benzobis(thiazole) Unit for Efficient Organic Solar Cells with Low Energy Loss

Zhan

Lau

et al. 2019

Small Methods

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The simultaneous achievement of a low energy loss and high external quantum efficiency (EQE) response is the prerequisite for high power conversion efficiencies of organic solar cells (OSCs). Herein, this issue is examined through the design of two novel near‐infrared (NIR) nonfullerene acceptors (X‐PCIC and X1‐PCIC) with an absorption extending to 900 nm, which is realized by using benzobis(thiazole) unit as the core. This study reveals that benzobis(thiazole) unit with the quinoid‐resonance effect and electron‐withdrawing property is a good building block in extending absorption and maintaining suitable energy levels. Single crystal cultivation proves the function of S···N noncovalent interaction in locking molecular geometry. Besides, through adopting two different terminals (fluorinated terminal for X‐PCIC and thiophene‐fused terminal for X1‐PCIC), it is found that an increase in the J‐aggregation strength has a significant positive effect on the EQE response of the devices through the formation of more suitable domain sizes and crystallinity in the films, while the energy loss remains low (≈0.53 eV) and unaffected. Thus, a high efficiency of 11.50% is presented for OSC based on the X‐PCIC with stronger J‐aggregation strength, better than that (10.17%) based on the X1‐PCIC with weaker J‐aggregation strength. This work clearly demonstrates the application of benzobis(thiazole) unit in efficient small molecule acceptors and the importance of J‐aggregation modulation for the simultaneous achievement of low energy loss and high EQE response.

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Section: Doi: 101002/smtd201900531mentioning

confidence: 99%

Near‐Infrared Nonfullerene Acceptors Based on Benzobis(thiazole) Unit for Efficient Organic Solar Cells with Low Energy Loss

Zhan

Lau

et al. 2019

Small Methods

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“…At high absorber thicknesses of around 300 nm, however, the current generation of organic solar cells still suffers from at most decent fill factors suggesting problems with charge collection. [ 6,14–16 ] Thus, characterization of recombination and transport as the two key factors limiting charge collection remains an important research topic.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Light‐Intensity Dependence of the Short‐Circuit Current of Organic Solar Cells

Hartnagel

Kirchartz

2020

Advcd Theory and Sims

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In organic solar cells, bimolecular recombination is a key factor limiting the device performance and creating the need for characterization. Light‐intensity‐dependent short‐circuit current density measurements are a frequently used tool to qualitatively analyze bimolecular recombination in a device. When applying a 0D model, bimolecular recombination is expected to reduce the otherwise linear correlation of the short‐circuit current density Jsc and the light intensity Φ to a sublinear trend. It is shown by numerical simulations that the slope of the Jsc–Φ curve is affected by the recombination mechanism (direct or via traps), the spatial distribution of charge carriers and—in thick solar cells—by space charge effects. Only the combination of these effects allows proper explanation of the different cases, some of which cannot be explained in a simple 0D device model.

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“…In 2018, Hou and co‐workers introduced selenophene in the IT core to increase quinoidal resonance and thereby lower E g opt . The newly synthesized core was attached to DCI and dichloro‐DCI (CIC) end‐capping units to form SeTIC ( A13 , Figure ) and SeTIC4Cl , respectively.…”

Section: Nfas and Various Aspects Of Freasmentioning

confidence: 99%

“…However, low electron mobilities of FREAs, when compared to FAs, prevent fabrication thick blends without sacrificing FF. Though, there are some recent examples where FREAs with high mobilities were used in relatively thick (more than 200 nm) OSCs . Furthermore, the current understanding of photochemical processes of FA‐OSCs may not be applicable for FREA‐OSCs, and detailed research on the mechanisms of the photocurrent generation is needed.…”

Section: Introductionmentioning

confidence: 99%

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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Selenopheno[3,2-b]thiophene-Based Narrow-Bandgap Nonfullerene Acceptor Enabling 13.3% Efficiency for Organic Solar Cells with Thickness-Insensitive Feature

Cited by 145 publications

References 70 publications

Near‐Infrared Nonfullerene Acceptors Based on Benzobis(thiazole) Unit for Efficient Organic Solar Cells with Low Energy Loss

Near‐Infrared Nonfullerene Acceptors Based on Benzobis(thiazole) Unit for Efficient Organic Solar Cells with Low Energy Loss

Understanding the Light‐Intensity Dependence of the Short‐Circuit Current of Organic Solar Cells

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

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