High-Efficiency Thermal-Annealing-Free Organic Solar Cells Based on an Asymmetric Acceptor with Improved Thermal and Air Stability

Zhang, Jinsheng; Han, Yifei; Zhang, Wenxia; Ge, Jinfeng; Xie, Lin; Xia, Zi‐Hao; Song, Wei; Yang, Daobin; Zhang, Xiaoli; Ge, Ziyi

doi:10.1021/acsami.0c17423

Cited by 51 publications

(45 citation statements)

References 47 publications

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“…The newly designed acceptor TB-4F was synthesized according to Scheme . Compound 1 was synthesized according to our previous study . Compound 1 and compound 2 (hyperchemical, 99%) were dissolved in CHCl 3 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…For the trade-off of absorption, reducing a thiophene ring of the state-of-the-art molecule Y6 and changing the alky chain could be carried out to obtain the novel asymmetric acceptor TB-4F. A previous study by our group indicated the S-shaped conformation induced by the noncovalent interaction between S and O atoms . Density functional theory (DFT) at the B3LYP/6-31g** level was conducted to study the molecular properties.…”

Section: Results and Discussionmentioning

confidence: 99%

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Understanding the Effect of Sequential Deposition Processing for High-Efficient Organic Photovoltaics to Harvest Sunlight and Artificial Light

Xie

Zhang

Song

et al. 2021

ACS Appl. Mater. Interfaces

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As the market of the Internet of Things (IoT) increases, great attention has been paid to the development of high-efficient organic photovoltaics (OPVs) utilizing artificial light. However, in a real indoor condition, the power density contribution of the artificial light cannot exceed 35% in the combination of indoor and outdoor irradiation, which indicates that the illumination of sunlight cannot be ignored during daytime. Hence, it is urgent to develop high-efficient OPVs in indoor conditions taking into account both sunlight and artificial light. In this work, a novel asymmetric molecule TB-4F was synthesized to trade-off the absorption spectrum that can be applied under both artificial light and sunlight. In conventional bulk-heterojunction (C-BHJ), it was figured out that due to nonoptimal morphology some carriers failed to be efficiently collected. Herein, a sequential deposition bulk-heterojunction (SD-BHJ) as an alternative fabrication method successfully enhanced the performance of OPVs, under both artificial light and sunlight, which was attributed to the favorable microstructure being vertically distributed in the active layer. Notably, the PCE was significantly increased by 25% for SD-BHJ compared to C-BHJ under artificial light, owing to the strong effect of trap-assisted recombination and dark current on PCE in the condition of low carrier density. Our result indicates that an asymmetric molecule with a blue-shifted spectrum fabricated by SD-BHJ can be a promising candidate that can be applied in indoor environments to harvest sunlight and artificial light simultaneously.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Understanding the Effect of Sequential Deposition Processing for High-Efficient Organic Photovoltaics to Harvest Sunlight and Artificial Light

Xie

Zhang

Song

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

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“…Organic solar cells (OSCs), as the third generation photovoltaic technology, have attracted increasing interest over the last few decades due to their advantages of light weight, low cost, easy fabrication and mechanical flexibility. [ 1‐6 ] Especially, the flexible and semi‐transparent (as well as color tunable) active layer turns out to be the most distinguished feature of OSCs, which is superior to conventional silicon‐based solar cells in some special applications. For instance, OSCs are competent to be used in building‐integrated photovoltaic and wearable electronics.…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processed Silver Nanowire as Flexible Transparent Electrodes in Organic Solar Cells

Yang

Hou

2021

Chin. J. Chem.

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Silver | Nanostructures | Conducting materials | Electrode | Organic solar cellsOrganic solar cells (OSCs) have attracted much attention due to their advantages in fabricating flexible and semi-transparent devices. Especially, the light weight, flexibility and spectral adjustability make OSCs superior to silicon, perovskite and other thin film based solar cells in applications of integrated photovoltaic devices and wearable electronics. In flexible and semi-transparent OSCs, transparent conducting electrodes (TCEs) play a key role in obtaining high performances. Among various TCEs, silver nanowire (AgNW) has become a promising candidate due to its low sheet resistance, high optical transparency, excellent mechanical flexibility and solution processability. In this article, we review the recent advances in AgNW-based TCEs and their applications in the field of OSCs. Firstly, we introduce the general properties of AgNW, including optoelectronic and mechanical characteristics. Secondly, the preparation methods of AgNW are discussed, along with some approaches on the optimization of AgNW to overcome the shortcomings of TCEs. Thirdly, we discuss the applications of AgNW as TCEs in fabricating flexible and semi-transparent OSCs, including the use of AgNW as bottom and top electrodes. Finally, we point out the challenges in AgNW-based TCEs and suggest several guidelines for preparing AgNW so as to meet the demands for the practical use of OSCs.

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“…Organic solar cells (OSCs) have achieved rapid development originating from research on the physical characteristics and chemical synthesis of photovoltaic semiconductor materials in this field for several decades. − In particular, the successful synthesis of Y6 and its derivative provided OSCs with a maximal power conversion efficiency (PCE) exceeding 19%. − However, OSCs need both high performance and excellent long-term stability to realize successful commercialization. When exposed to water, oxygen and irradiation, most organic photovoltaic semiconductor materials inevitably experience chemical degradation. − Meanwhile, encapsulation has been used to improve the stabilities of OSCs by effectively preventing the infiltration of oxygen and water . − …”

Section: Introductionmentioning

confidence: 99%

Dual Interface Protection for High Performance and Excellent Long-Term Stability of Organic Solar Cells

Xiao

Yao

et al. 2021

ACS Appl. Mater. Interfaces

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Stability is still the main barrier to the commercial application of organic solar cells (OSCs), although the maximal power conversion efficiency (PCE) value has exceeded 19%. The encapsulation technique is an effective and vital way to guarantee the long-term stabilities of OSCs, but it can only avoid the penetration of water and oxygen from the environment. Herein, we introduced a structure that provides dual interface protection by using commercially available and chemically stable polyvinylidene fluoride (PVDF) as the cathode interface protection layer working as the cathode interlayer (CIL) and poly(styrene-comethyl-methacrylate) (PS-r-PMMA) as the anode interface protection layer between the poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) and the active layer. With this structure, both the migration of impurities caused by degradation of the interfacial layer and the infiltration of oxygen and water in the air can be prevented. PVDF can effectively provide optimal electron transfer by improving the surface potential of active layers and lowering the work function of the Al electrode. PS-r-PMMA can improve the hydrophobicity of PEDOT:PSS and induce optimized phase separation, facilitating charge transfer. After storage in an air environment with a humidity of approximately 60% for 3600 h, the device based on the PM6:IT-4F blend film with dual interface protection showed a decrease in its PCE value from 13.43 to 10.90%, retaining 81.2% of its original PCE value, in contrast to the sharp decrease in the PCE value from 13.66 to 0.74% of the device without dual interface protection. The dual interface protection design could also be useful in the high-performance PM6:Y6 system, which shows a champion PCE of 15.39% and shows potential for the effective fabrication of stable OSCs in the future.

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High-Efficiency Thermal-Annealing-Free Organic Solar Cells Based on an Asymmetric Acceptor with Improved Thermal and Air Stability

Cited by 51 publications

References 47 publications

Understanding the Effect of Sequential Deposition Processing for High-Efficient Organic Photovoltaics to Harvest Sunlight and Artificial Light

Understanding the Effect of Sequential Deposition Processing for High-Efficient Organic Photovoltaics to Harvest Sunlight and Artificial Light

Solution‐Processed Silver Nanowire as Flexible Transparent Electrodes in Organic Solar Cells

Dual Interface Protection for High Performance and Excellent Long-Term Stability of Organic Solar Cells

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