15% Efficiency Tandem Organic Solar Cell Based on a Novel Highly Efficient Wide‐Bandgap Nonfullerene Acceptor with Low Energy Loss

Liu, Gongchu; Jia, Jianchao; Zhang, Kai; Jia, Xiao’e; Yin, Qingwu; Zhong, Wenkai; Li, Li; Huang, Fei; Cao, Yong

doi:10.1002/aenm.201803657

Cited by 158 publications

(125 citation statements)

References 51 publications

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“…Over the last thirty years, great efforts have been made to promote the rapid progress of OSCs, leading to over 17% power conversion efficiencies (PCEs) . The innovative material design contributes a lot to achieve high PCEs of OSCs . As compared with other photovoltaic technologies like silicon or perovskite solar cells, one of the most important challenges that limits the PCEs of OSCs is the modest open‐circuit voltage ( V OC ) because of the large energy losses ( E loss ).…”

Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

et al. 2019

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Summary of main observation and conclusion One of the most important challenges that hinders the power conversion efficiencies (PCEs) of organic solar cells (OSCs) is the modest open‐circuit voltages (VOC) due to large energy losses. The large driving force during for charge generation and the non‐radiative recombination are the main causes of energy losses. To maximize the VOC of OSCs, herein, we modulate the end‐groups and design a non‐fullerene acceptor ITCCM‐O, which shows a bandgap of 2.0 eV. By blending a polymer donor named J52, the device demonstrates a PCE of 5.5% with an outstanding VOC of 1.34 V, which is the highest value for single‐junction OSCs over 5% PCEs. The high VOC is benefited from 1) the negligible driving force for charge transfer, and 2) the suppressed non‐radiative recombination loss, as low as 0.22 V.

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Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

et al. 2019

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“…[1][2][3][4][5][6][7][8] Generally, depending on the www.advenergymat.de www.advancedsciencenews.com densities (J sc s) and fill factors (FFs) of this type of all-smallmolecule ternary solar cells have been markedly improved. [1][2][3][4][5][6][7][8] Generally, depending on the www.advenergymat.de www.advancedsciencenews.com densities (J sc s) and fill factors (FFs) of this type of all-smallmolecule ternary solar cells have been markedly improved.…”

Section: Introductionmentioning

confidence: 99%

Constructing High‐Performance All‐Small‐Molecule Ternary Solar Cells with the Same Third Component but Different Mechanisms for Fullerene and Non‐fullerene Systems

Chang

Zhu

et al. 2019

Advanced Energy Materials

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donors used, OSCs fall into two categories: polymer solar cells and small-molecule solar cells. While according to the acceptor used, they can be divided into fullerene solar cells and non-fullerene solar cells. Polymer solar cells have always been the focus of attention, and a breakthrough, that is., a power conversion efficiency (PCE) of over 15% has been achieved for this type of device. [9] In contrast, a noticeable gap exists between small-molecule solar cells and polymer solar cells whether in terms of performances or the research scale. However, small molecule donors still have some unique advantages over polymer donors, such as definite chemical structure, extremely high purity and excellent reproducibility, which could be better suited for future large-scale applications of OSCs. [10][11][12][13] Particularly, there has been a new upsurge for developing all-small-molecule solar cells owing to the widespread use of non-fullerene acceptors. [14,15] Although currently both fullerene-and non-fullerene-based allsmall-molecule solar cells present high PCEs of over 11%, [16,17] the defects in each system should be clearly addressed. For instance, due to the weak absorption ability of fullerene acceptors, such as [6,6]-phenyl-C 61 -butyric acid methyl ester (PC 61 BM) and [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM), in the short-wavelength and near-infrared regions, it is difficult to obtain much higher photocurrent. [18] On the other hand, when selecting a non-fullerene acceptor, like IDIC, [19] which possesses superior crystallization capability, [20] it is hard to achieve ideal film morphology with nanoscale phase separation. Therefore, overcoming these issues for binary devices is of great importance for continued evolution of all-small-molecule solar cells.Here, utilizing the individual advantages of both fullerene and non-fullerene acceptors has been demonstrated as an attractive strategy to resolve the above-mentioned problems. [21] Recently, several cases of all-small-molecule ternary solar cells with significant increase in the PCE, which employed one small molecule donor material, one fullerene acceptor (PC 71 BM) and one non-fullerene acceptor, have been reported. [21,22] In these cases, PC 71 BM has played an important role in modulating the film morphology of the ternary system, which could significantly facilitate charge generation and transportation and suppress charge recombination. As a result, the short-circuit current Two types of all-small-molecule ternary solar cells consisting of two smallmolecule donors and one acceptor (fullerene/non-fullerene) are developed. Interestingly, both these devices have a common component: a carefully designed medium bandgap small molecule, which possesses appropriate energy levels and displays good compatibility with the host donor. In the fullerene system, the charge-relaying role of the additive donor is confirmed by the improved charge transportation and suppressed charge recombination. While in the non-fullerene system, the mixed face-on and ed...

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“…However, the performance of OSCs is still low compared to the one of conventional inorganic solar cells, owing to the relatively narrow absorption of organic materials. The tandem or multijunction approach, consisting of monolithically‐stacked, series‐connected photoactive layers with complementary absorption spectra, has been proven as one of the most successful concepts addressing the main loss mechanisms in single‐junction OSCs, e.g., the thermalization loss and the loss due to sub‐bandgap transmission 5–12…”

Section: Photovoltaic Performances Of Inverted Single Junction and Homentioning

confidence: 99%

A Cross‐Linked Interconnecting Layer Enabling Reliable and Reproducible Solution‐Processing of Organic Tandem Solar Cells

Liu

Gao

et al. 2020

Advanced Energy Materials

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The performance of tandem organic solar cells (OSCs) is directly related to the functionality and reliability of the interconnecting layer (ICL). However, it is a challenge to develop a fully functional ICL for reliable and reproducible fabrication of solution‐processed tandem OSCs with minimized optical and electrical losses, in particular for being compatible with various state‐of‐the‐art photoactive materials. Although various ICLs have been developed to realize tandem OSCs with impressively high performance, their reliability, reproducibility, and generic applicability are rarely analyzed and reported so far, which restricts the progress and widespread adoption of tandem OSCs. In this work, a robust and fully functional ICL is developed by incorporating a hydrolyzed silane crosslinker, (3‐glycidyloxypropyl)trimethoxysilane (GOPS), into poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and its functionality for reliable and reproducible fabrication of tandem OSCs based on various photoactive materials is validated. The cross‐linked ICL can successfully protect the bottom active layer against penetration of high boiling point solvents during device fabrication, which widely broadens the solvent selection for processing photoactive materials with high quality and reliability, providing a great opportunity to continuously develop the tandem OSCs towards future large‐scale production and commercialization.

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15% Efficiency Tandem Organic Solar Cell Based on a Novel Highly Efficient Wide‐Bandgap Nonfullerene Acceptor with Low Energy Loss

Cited by 158 publications

References 51 publications

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

Constructing High‐Performance All‐Small‐Molecule Ternary Solar Cells with the Same Third Component but Different Mechanisms for Fullerene and Non‐fullerene Systems

A Cross‐Linked Interconnecting Layer Enabling Reliable and Reproducible Solution‐Processing of Organic Tandem Solar Cells

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