Design of a Highly Crystalline Low-Band Gap Fused-Ring Electron Acceptor for High-Efficiency Solar Cells with Low Energy Loss

Shi, Xueliang; Zuo, Lijian; Jo, Sae Byeok; Gao, Ke; Lin, Francis; Liu, Feng; Jen, Alex K.‐Y.

doi:10.1021/acs.chemmater.7b02853

Cited by 184 publications

(178 citation statements)

References 45 publications

Supporting

Mentioning

165

Contrasting

Order By: Relevance

“…[29][30][31][32][33][34][35][36][37] Based on the Shockley-Queisser efficiency limit model, the ideal bandgap (≈1.34 eV) of the photoactive layer for AM 1.5G illumination could achieve the optimal photovoltaic performance. [30,[39][40][41][42] Zhan and co-workers [43] and Jen and co-workers [44] have reported a fused-ring thiophenethieno [3,2-b]thiophene-thiophene-based hexacyclic low-bandgap NFA (named IHIC or 4TIC, 1.38 eV), exhibiting a PCE of 9.77% with an relative high visible transmittance. [30,[39][40][41][42] Zhan and co-workers [43] and Jen and co-workers [44] have reported a fused-ring thiophenethieno [3,2-b]thiophene-thiophene-based hexacyclic low-bandgap NFA (named IHIC or 4TIC, 1.38 eV), exhibiting a PCE of 9.77% with an relative high visible transmittance.…”

Section: Doi: 101002/adma201707150mentioning

confidence: 99%

“…[38] Guided by this predictive principle, several methods have been developed to broaden the absorption spectra of NFAs, such as extending the conjugation and enhancing the ICT effect. [30,[39][40][41][42] Zhan and co-workers [43] and Jen and co-workers [44] have reported a fused-ring thiophenethieno[3,2-b]thiophene-thiophene-based hexacyclic low-bandgap NFA (named IHIC or 4TIC, 1.38 eV), exhibiting a PCE of 9.77% with an relative high visible transmittance. Hou and coworkers [45] have demonstrated an ultranarrow-bandgap NFA (IEICO-4F, 1.24 eV) through utilizing a spacer (alkoxy thiophene) to enhance the ICT effect and electron delocalization, indicating a PCE of 10.9% within a ternary OSC.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

et al. 2018

View full text Add to dashboard Cite

A new electron-rich central building block, 5,5,12,12-tetrakis(4-hexylphenyl)-indacenobis-(dithieno[3,2-b:2',3'-d]pyrrol) (INP), and two derivative nonfullerene acceptors (INPIC and INPIC-4F) are designed and synthesized. The two molecules reveal broad (600-900 nm) and strong absorption due to the satisfactory electron-donating ability of INP. Compared with its counterpart INPIC, fluorinated nonfullerene acceptor INPIC-4F exhibits a stronger near-infrared absorption with a narrower optical bandgap of 1.39 eV, an improved crystallinity with higher electron mobility, and down-shifted highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. Organic solar cells (OSCs) based on INPIC-4F exhibit a high power conversion efficiency (PCE) of 13.13% and a relatively low energy loss of 0.54 eV, which is among the highest efficiencies reported for binary OSCs in the literature. The results demonstrate the great potential of the new INP as an electron-donating building block for constructing high-performance nonfullerene acceptors for OSCs.

show abstract

Section: Doi: 101002/adma201707150mentioning

confidence: 99%

mentioning

confidence: 99%

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

et al. 2018

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Compared with traditional fullerene acceptors such as [6,6]-phenyl-C61/C71-butyric acid methyl ester (PC 61 BM/PC 71 BM), PSCs based on the n-OS acceptors have shown great potential in device performance and device stability. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Compared with traditional fullerene acceptors such as [6,6]-phenyl-C61/C71-butyric acid methyl ester (PC 61 BM/PC 71 BM), PSCs based on the n-OS acceptors have shown great potential in device performance and device stability.…”

mentioning

confidence: 99%

Side‐Chain Impact on Molecular Orientation of Organic Semiconductor Acceptors: High Performance Nonfullerene Polymer Solar Cells with Thick Active Layer over 400 nm

Luo

Sun

Chen

et al. 2018

Advanced Energy Materials

124

View full text Add to dashboard Cite

In recent years, n-type organic semiconductor (n-OS) (or called as nonfullerene) acceptors have been gaining their popularity in low production cost, light weight, flexible and large-area applications in polymer solar cells (PSCs) due to their excellent optical absorption, tunable energy levels, facile synthesis, and good solution-processability. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Compared with traditional fullerene acceptors such as [6,6]-phenyl-C61/C71-butyric acid methyl ester (PC 61 BM/PC 71 BM), PSCs based on the n-OS acceptors have shown great potential in device performance and device stability. [14,[17][18][19][20][21][22][23][24][25][26][27][28][29] And the n-OS acceptors-based devices have achieved power conversion efficiency (PCE) as high as over 12%. [30][31][32][33][34][35][36][37][38][39][40][41][42] The rational design of the n-OS acceptors is typically based on molecular packing and orbital energetics strategies that are utilized to effectively alter the extension of π conjugation and frontier orbital energy levels. [43][44][45][46][47] Up to now, great efforts have been devoted to development of building blocks, terminal functional groups and side chains, which can effectively tune the band gap and energy levels of the n-OS acceptors. Among them, relatively little attention have been paid to the sidechain engineering of the n-OS acceptors. [5,[48][49][50][51] In comparison with backbone structure and terminal functional groups manipulation, "side-chain engineering" strategy can not only avoid the time-consuming end-capping deficient group and backbone synthesis, but also can improve the photovoltaic performance of PSCs. [33,49,[52][53][54] In addition, this strategy provides an intuitive approach to study the structure-property relationship for the acceptor with the small alterations of the side-chain structures. Structural modification in sidechains of the acceptor, such as changing in length, position, symmetry, and dimension, can remarkably affect molecular packing and intermolecular interaction. [5,[48][49][50][51] For example, the side-chain isomerization of ITIC (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4hexylphenyl)-dithieno[2,3-d:2,3-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene) with meta-alkyl-phenyl instead of para-alkyl-phenyl led to the acceptor m-ITIC with more evident crystallinity and higher electron mobility; [48] the replacement of the side chains of rigid indacenodithieno[3,2-b]-thiophene (IDTT) core from 4-hexylphenyl to 5-hexylthienyl downshifts the lowest unoccupied molecular orbital (LUMO) energy levels and improves the A new n-type organic semiconductor (n-OS) acceptor IDTPC with n-hexyl side chains is developed. Compared to side chains with 4-hexylphenyl counterparts (IDTCN), such a design endows the acceptor of IDTPC with higher electron mobility, more ordered face-on molecular packing, and lower band gap. Therefore, the IDTPC-based polymer solar cells (PSCs) with a newly developed wide bandgap polymer PTQ10 as donor exhi...

show abstract

“…When OSCs were fabricated with narrow bandgap polymer PTB7‐Th, a PCE of 9.77% with a high J SC of 18.75 mA cm −2 , a good FF of 0.67 was reported, which indicates its great potential in ST‐OSCs. Jen and co‐workers also independently reported the identical FREA, abbreviated name, 4TIC . OSCs blended with wide bandgap polymer PBDB‐T revealed a high PCE of 10.43%.…”

Section: Nfas and Various Aspects Of Freasmentioning

confidence: 87%

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

Dey

2019

Small

139

View full text Add to dashboard Cite

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.

show abstract

Design of a Highly Crystalline Low-Band Gap Fused-Ring Electron Acceptor for High-Efficiency Solar Cells with Low Energy Loss

Cited by 184 publications

References 45 publications

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

Side‐Chain Impact on Molecular Orientation of Organic Semiconductor Acceptors: High Performance Nonfullerene Polymer Solar Cells with Thick Active Layer over 400 nm

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

Contact Info

Product

Resources

About