A small molecular electron acceptor based on asymmetric hexacyclic core of thieno[1,2- b ]indaceno[5,6- b ′]thienothiophene for efficient fullerene-free polymer solar cells

Zhai, Wenchao; Tang, Ailing; Xiao, Bo; Wang, Xiaochen; Chen, Fan; Zhou, Erjun

doi:10.1016/j.scib.2018.05.025

Cited by 29 publications

(19 citation statements)

References 49 publications

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“…The high charge mobility and the well balanced μ h /μ e should play a vital role in determining the performance of OSCs, which can well explain the gradually enhanced FFs of ternary OSCs along with MF1 content increase in acceptors. [ 35–38 ]…”

Section: Resultsmentioning

confidence: 99%

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Yang

Gao

et al. 2020

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Efficient organic solar cells (OSCs) are fabricated using polymer PM6 as donor, and IPTBO‐4Cl and MF1 as acceptors. The power conversion efficiency (PCE) of IPTBO‐4Cl based and MF1 based binary OSCs individually arrive to 14.94% and 12.07%, exhibiting markedly different short circuit current density (JSC) of 23.18 mA cm−2 versus 17.01 mA cm−2, fill factor (FF) of 72.17% versus 78.18% and similar open circuit voltage (VOC) of 0.893 V versus 0.908 V. The two acceptors, IPTBO‐4Cl and MF1, have similar lowest unoccupied molecular orbital levels, which is beneficial for efficient electron transport in the ternary active layer. The PCE of optimized ternary OSCs arrives to 15.74% by incorporating 30 wt% MF1 in acceptors, resulting from the simultaneously increased JSC of 23.20 mA cm−2, VOC of 0.897 V, and FF of 75.64% in comparison with IPTBO‐4Cl based binary OSCs. The gradually increased FFs of ternary OSCs indicate the well‐optimized phase separation and molecular arrangement with MF1 as morphology regulator. This work may provide a new viewpoint for selecting an appropriate third component to achieve efficient ternary OSCs from materials and photovoltaic parameters of two binary OSCs.

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Section: Resultsmentioning

confidence: 99%

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Yang

Gao

et al. 2020

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“…The influence of fluorinated IC end‐capping groups on the photovoltaic performance of NFAs has been primarily focused on symmetric core unit systems . Asymmetry‐core‐based NFAs have been rarely studied, partly because it is more challenging to synthesize and purify an asymmetric core unit than its symmetric core unit counterpart. In this study, we designed and synthesized three asymmetric NFAs (TTPTTT‐IC, TTPTTT‐2F, and TTPTTT‐4F) using an asymmetric TTPTTT building block as the central core unit.…”

Section: Methodsmentioning

confidence: 99%

High‐Performance Eight‐Membered Indacenodithiophene‐Based Asymmetric A‐D‐A Type Non‐Fullerene Acceptors

Song

et al. 2018

Solar RRL

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Indacenodithiophene (IDT) has been widely used as the central core to design high‐performance acceptor‐donor‐acceptor (A‐D‐A)‐type non‐fullerene acceptors (NFAs). NFAs based on five‐, six‐, seven‐, and nine‐membered IDT have been successfully prepared. However, less research attention has been paid to the eight‐membered IDT derivative. In this study, a novel asymmetric TTPTTT building block as an eight‐membered IDT unit are designed and synthesized. The effect of nonfluorinated, monofluorinated, and difluorinated end‐capping groups on the photovoltaic performance of TTPTTT‐based NFAs are specifically investigated. By blending with the polymer donor PBT1‐C, organic solar cells (OSCs) based on TTPTTT‐IC, TTPTTT‐2F, and TTPTTT‐4F exhibited power conversion efficiencies (PCEs) of 7.91, 11.52, and 12.05%, respectively. Our results indicate that the asymmetric TTPTTT building block as an eight‐membered IDT derivative is a promising central core unit for designing high‐performance A‐D‐A type NFAs.

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“…However, the application of asymmetric fullerene SMAs was limited to a great extent owing to their disadvantages, such as restricted structure modification, weak absorption in the visible region, high production costs, and morphological instability. Therefore, nonfullerene SMAs have caught great research interest, and recent years have seen the rapid development and tremendous progress of both symmetric nonfullerene SMAs and asymmetric nonfullerene SMAs …”

Section: Introductionmentioning

confidence: 99%

Asymmetric Nonfullerene Small Molecule Acceptors for Organic Solar Cells

Xia

et al. 2019

Advanced Energy Materials

209

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EDPD acceptors, respectively. Since then, several promising asymmetric nonfullerene SMAs have been developed to pair with the polymer donor P3HT. [39][40][41][42][43] However, the development of asymmetric nonfullerene SMAs remained nearly stagnant from 2015 to 2016. This unfavorable situation has changed when asymmetric nonfullerene SMAs began to emerge in 2017 and experienced rapid development in the past 3 years. [32][33][34][35][36][37] In addition to maintaining the advantages of symmetric nonfullerene SMAs, [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] such as chemical structure diversity and good adjustability in photoelectrical properties, asymmetric nonfullerene SMAs may additionally exhibit stronger intermolecular binding energy and larger dipole moment than symmetric nonfullerene SMA counterparts. [33,35,44] Both stronger intermolecular binding energy and larger dipole moment are beneficial to reinforce intermolecular interaction, rendering asymmetric nonfullerene SMAs a promising class of nonfullerene SMAs to increase the fill factor (FF) and power conversion efficiency (PCE) in OSCs. To date, the PCEs of OSCs based on asymmetric nonfullerene SMAs have gradually increased from 1.27% in 2010 to nearly 14% in 2019. [31,38] There have been a large number of review articles summarizing the recent development of symmetric nonfullerene SMAs. [13][14][15][16][17][18][45][46][47][48][49][50][51] However, to the best of our knowledge, there has been no one review article specially focusing on asymmetric nonfullerene SMAs so far. Given the significant progress achieved recently for asymmetric nonfullerene SMAs, it is timely to briefly review the development of asymmetric nonfullerene SMAs in the past decade. Here, we first summarize the recent advances of asymmetric nonfullerene SMAs, including early reports of asymmetric nonfullerene SMAs, asymmetric PDI-based nonfullerene SMAs, and asymmetric acceptor-donor-acceptor (A-D-A)-type nonfullerene SMAs. Finally, we discuss the structure-property relationships and the perspectives for future development of asymmetric nonfullerene SMAs. Early Reports of Asymmetric Nonfullerene SMAsIn view of the shortcomings of asymmetric fullerene SMAs, some attempts have been made to develop asymmetric nonfullerene SMAs with easy access, tunable optical/electrochemical properties, and wide possibility of functionalization. [39][40][41][42][43] Generally, these asymmetric nonfullerene SMAs could be Symmetry breaking provides a new material design strategy for nonfullerene small molecule acceptors (SMAs). The past 10 years have witnessed significant advances in asymmetric nonfullerene SMAs in organic solar cells (OSCs) with power conversion efficiency (PCE) increasing from ≈1% to ≈14%. In this review, the progress of asymmetric nonfullerene SMAs, including early reports of asymmetric nonfullerene SMAs, asymmetric PDI-based nonfullerene SMAs, and asymmetric acceptor-donor-acceptor (A-D-A)-type nonfullerene SMAs, is summarized. The structure-property relation...

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A small molecular electron acceptor based on asymmetric hexacyclic core of thieno[1,2- b ]indaceno[5,6- b ′]thienothiophene for efficient fullerene-free polymer solar cells

Cited by 29 publications

References 49 publications

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

High‐Performance Eight‐Membered Indacenodithiophene‐Based Asymmetric A‐D‐A Type Non‐Fullerene Acceptors

Asymmetric Nonfullerene Small Molecule Acceptors for Organic Solar Cells

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