Highly Efficient Organic Solar Cells Based on S,N-Heteroacene Non-Fullerene Acceptors

Huang, Chuyi; Liao, Xunfan; Gao, Ke; Zuo, Lijian; Lin, Francis; Shi, Xueliang; Li, Chang‐Zhi; Liu, Hongbin; Li, Xiaosong; Liu, Feng; Chen, Yiwang; Chen, Hongzheng; Jen, Alex K.‐Y.

doi:10.1021/acs.chemmater.8b02276

Cited by 211 publications

(152 citation statements)

References 46 publications

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“…It was inferred that compared with L24 and L68 , the copolymer L810 relaxing from the ground state to the excitation state upon light excitation suffered the lower energy loss and then got the higher output voltage in the device . The reason may be ascribed to the more compact backbone of L810 than that of L24 and L68 . Therefore, the longer side chain of the copolymers reduced the energy loss and promoted the V oc values.…”

Section: Resultsmentioning

confidence: 99%

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Liao

Xie

Chen

et al. 2019

Adv Funct Materials

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The fluorobenzotriazole (FTAZ)‐based copolymer donors are promising candidates for nonfullerene polymer solar cells (PSCs), but suffer from relatively low photovoltaic performance due to their unsuitable energy levels and unfavorable morphology. Herein, three polymer donors, L24, L68, and L810, based on a chlorinated‐thienyl benzodithiophene (BDT‐2Cl) unit and FTAZ with different branched alkyl side chain, are synthesized. Incorporation of a chlorine (Cl) atom into the BDT unit is found to distinctly optimize the molecular planarity, energy levels, and improve the polymerization activity. Impressively, subtle side chain length of FTAZ realizes a dramatic improvement in all the device parameters, as revealed by the short‐current density (Jsc) improved from 7.41 to 20.76 mA cm−2, fill‐factor from 36.3 to 73.5%, and even the open‐circuit voltage (Voc) from 0.495 to 0.790 V. The best power conversion efficiency (PCE) of 12.1% is obtained from the L810‐based device, which is one of the highest values reported for FTAZ‐based PSCs so far. Notably, the corresponding external quantum efficiency curve keeps a very prominent value up to 80% from 500 to 800 nm. The notable performance is discovered from the reduced energy loss, improved molecular face‐on orientation, the down‐shifted energy levels, and optimized absorption coefficient regulated by side‐chain engineering.

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Section: Resultsmentioning

confidence: 99%

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Liao

Xie

Chen

et al. 2019

Adv Funct Materials

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“…[33,34] It was reflected in the decline of fill factor (FF) with the increase of film thickness. [1][2][3][4] Recently, due to the rapid innovation of nonfullerene acceptors (NFAs), [5][6][7][8][9][10][11][12][13][14][15] a great number of single-junction organic solar cells with power conversion efficiencies (PCEs) over 15% [16][17][18][19][20][21] have [35,36] Thus, it is still a challenge to obtain high efficiency devices with active layer thickness tolerance.…”

mentioning

confidence: 99%

“…[1][2][3][4] Recently, due to the rapid innovation of nonfullerene acceptors (NFAs), [5][6][7][8][9][10][11][12][13][14][15] a great number of single-junction organic solar cells with power conversion efficiencies (PCEs) over 15% [16][17][18][19][20][21] have [1][2][3][4] Recently, due to the rapid innovation of nonfullerene acceptors (NFAs), [5][6][7][8][9][10][11][12][13][14][15] a great number of single-junction organic solar cells with power conversion efficiencies (PCEs) over 15% [16][17][18][19][20][21] have…”

mentioning

confidence: 99%

High Performance Thick‐Film Nonfullerene Organic Solar Cells with Efficiency over 10% and Active Layer Thickness of 600 nm

Zhang

Feng

Meng

et al. 2019

Advanced Energy Materials

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been reported. And for tandem solar cells, the PCE has reached 17%. [22] However, the vast majority of those device performances were obtained with layer-thicknesses at around 100 nm [23][24][25][26][27][28][29] and decreased drastically with the increase of the active layer thickness, which limits their application in the roll to roll large-scale solution printing technology. [30,31] Furthermore, 20%-40% of the incident photon flux were wasted in such a active layer thickness, [32] which directly limits the short circuit current density (J sc ) of the corresponding OSCs. Thus, it is necessary to develop high efficiency OSCs with tolerance of the active layer thickness. However, a lot of research work have proved that the charge collection efficiency of a device is inversely proportional to the square of the film thickness of the active layer. [33,34] It was reflected in the decline of fill factor (FF) with the increase of film thickness. Also, the J sc will decrease due to the severe bimolecular recombination. [35,36] Thus, it is still a challenge to obtain high efficiency devices with active layer thickness tolerance. To date, in the reported cases with active layer thickness tolerance, most are based on fullerene derivative acceptors and it has been found that the donor materials with high crystallinity and balanced mobility with fullerene derivative acceptors manifested better performance with high film thickness. [35][36][37][38] Compared with fullerene derivatives based OSCs, it is much more challenging to realize thick-film NFAs OSCs with high performance since the electron mobilities of NFAs are usually lower than that of fullerene derivative acceptors. [39,40] Thus, the charge transport and collection process in those NFA based thick films are not efficient. So far, great attentions have been drawn on the NFA based thick film OSCs and much progress have been made. For examples, Yip and co-workers reported devices based on PffBT4T-2OD:EH-IDTBR and realized a PCE of 9.1% with an active layer thickness of 300 nm by optimizing device architectures to overcome the space-charge effects. [41] Zhang and co-workers reported devices based on PM6:IDIC with PCEs of 11.9% under the film thickness of 150 nm and 11.3% under the condition of 255 nm condition. Although the device performance is good enough, the cases with thicker active layers Developing efficient organic solar cells (OSCs) with relatively thick active layer compatible with the roll to roll large area printing process is an inevitable requirement for the commercialization of this field. However, typical laboratory OSCs generally exhibit active layers with optimized thickness around 100 nm and very low thickness tolerance, which cannot be suitable for roll to roll process. In this work, high performance of thick-film organic solar cells employing a nonfullerene acceptor F-2Cl and a polymer donor PM6 is demonstrated. High power conversion efficiencies (PCEs) of 13.80% in the inverted structure device and 12.83% in the conventional structure device are achi...

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“…Zhan and co‐workers then reported a novel A‐D‐A type FREA, SN6IC ( A22 , Figure ) where cyclopentadiene in IHIC is replaced with pyrrole ring . Exchanging the sp 3 ‐hybridized C atom with an sp 2 ‐hybridized N atom led to delocalization of N lone pair to the backbone of the core extending the delocalized π‐conjugation.…”

Section: Nfas and Various Aspects Of Freasmentioning

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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Highly Efficient Organic Solar Cells Based on S,N-Heteroacene Non-Fullerene Acceptors

Cited by 211 publications

References 46 publications

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

High Performance Thick‐Film Nonfullerene Organic Solar Cells with Efficiency over 10% and Active Layer Thickness of 600 nm

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

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