共查询到20条相似文献,搜索用时 15 毫秒
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Improving Interfacial Charge Recombination in Planar Heterojunction Perovskite Photovoltaics with Small Molecule as Electron Transport Layer 下载免费PDF全文
Ning Wang Kexiang Zhao Tao Ding Wenbo Liu Ali Said Ahmed Zongrui Wang Miaomiao Tian Xiao Wei Sun Qichun Zhang 《Liver Transplantation》2017,7(18)
Although perovskite solar cells (PSCs) have emerged as a promising alternative to widely used fossil fuels, the involved high‐temperature preparation of metal oxides as a charge transport layer in most state‐of‐the‐art PSCs has been becoming a big stumbling block for future low‐temperature and large‐scale R2R manufacturing process. Such an issue strongly encourages scientists to find new type of materials to replace metal oxides. Except for expensive PC61BM with unmanageable morphology and electrical properties, the past investigation on the development of low‐temperature‐processed and highly efficient electron transport layers (ETLs) has met some mixed success. In order to further enhance the performance of all‐solution‐processed PSCs, we propose a novel n‐type sulfur‐containing small molecule hexaazatrinaphtho[2,3‐c][1,2,5]thiadiazole (HATNT) with high electron mobility up to 1.73 × 10?2 cm2 V?1 s?1 as an ETL in planar heterojunction PSCs. A high power conversion efficiency of 18.1% is achieved, which is fully comparable with the efficiency from the control device fabricated with PC61BM as ETL. This superior performance mainly attributes from more effective suppression of charge recombination at the perovskite/HATNT interface than that between the perovskite and PC61 BM. Moreover, high electron mobility and strong interfacial interaction via S? I or S? Pb bonding should be also positive factors. Significantly, our results undoubtedly enable new guidelines in exploring n‐type organic small molecules for high‐performance PSCs. 相似文献
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Perovskite Solar Cells: Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States,Charge Transport,and Recombination (Adv. Energy Mater. 16/2018) 下载免费PDF全文
Yinghong Hu Eline M. Hutter Philipp Rieder Irene Grill Jonas Hanisch Meltem F. Aygüler Alexander G. Hufnagel Matthias Handloser Thomas Bein Achim Hartschuh Kristofer Tvingstedt Vladimir Dyakonov Andreas Baumann Tom J. Savenije Michiel L. Petrus Pablo Docampo 《Liver Transplantation》2018,8(16)
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Solar Cells: Amino‐Functionalized Conjugated Polymer as an Efficient Electron Transport Layer for High‐Performance Planar‐Heterojunction Perovskite Solar Cells (Adv. Energy Mater. 5/2016) 下载免费PDF全文
Chen Sun Zhihong Wu Hin‐Lap Yip Hua Zhang Xiao‐Fang Jiang Qifan Xue Zhicheng Hu Zhanhao Hu Yan Shen Mingkui Wang Fei Huang Yong Cao 《Liver Transplantation》2016,6(5)
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Solar Cells: Ionic Liquid Control Crystal Growth to Enhance Planar Perovskite Solar Cells Efficiency (Adv. Energy Mater. 20/2016) 下载免费PDF全文
Ji‐Youn Seo Taisuke Matsui Jingshan Luo Juan‐Pablo Correa‐Baena Fabrizio Giordano Michael Saliba Kurt Schenk Amita Ummadisingu Konrad Domanski Mahboubeh Hadadian Anders Hagfeldt Shaik M. Zakeeruddin Ullrich Steiner Michael Grätzel Antonio Abate 《Liver Transplantation》2016,6(20)
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Solar Cells: p‐Type CuI Islands on TiO2 Electron Transport Layer for a Highly Efficient Planar‐Perovskite Solar Cell with Negligible Hysteresis (Adv. Energy Mater. 5/2018) 下载免费PDF全文
Mahdi Malekshahi Byranvand Taewan Kim Seulki Song Gyeongho Kang Seung Un Ryu Taiho Park 《Liver Transplantation》2018,8(5)
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Solar Cells: Understanding Charge Transport in Molecular Blend Films in Terms of Structural Order and Connectivity of Conductive Pathways (Adv. Energy Mater. 9/2016) 下载免费PDF全文
Christopher M. Proctor Abhishek S. Kher John A. Love Ye Huang Alexander Sharenko Guillermo C. Bazan Thuc‐Quyen Nguyen 《Liver Transplantation》2016,6(9)
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Perovskite Solar Cells: Efficient Perovskite Solar Cells over a Broad Temperature Window: The Role of the Charge Carrier Extraction (Adv. Energy Mater. 22/2017) 下载免费PDF全文
Shuyan Shao Jian Liu Hong‐Hua Fang Li Qiu Gert H. ten Brink Jan C. Hummelen L. Jan Anton Koster Maria Antonietta Loi 《Liver Transplantation》2017,7(22)
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Solar Cells: Domain Compositions and Fullerene Aggregation Govern Charge Photogeneration in Polymer/Fullerene Solar Cells (Adv. Energy Mater. 11/2014) 下载免费PDF全文
Sameer Vajjala Kesava Zhuping Fei Adam D. Rimshaw Cheng Wang Alexander Hexemer John B. Asbury Martin Heeney Enrique D. Gomez 《Liver Transplantation》2014,4(11)
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Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells 下载免费PDF全文
Aren Yazmaciyan Martin Stolterfoht Paul L. Burn Qianqian Lin Paul Meredith Ardalan Armin 《Liver Transplantation》2018,8(18)
Achieving the highest power conversion efficiencies in bulk heterojunction organic solar cells requires a morphology that delivers electron and hole percolation pathways for optimized transport, plus sufficient donor:acceptor contact area for near unity charge transfer state formation. This is a significant structural challenge, particularly in semiconducting polymer:fullerene systems. This balancing act in the model high efficiency PTB7:PC70BM blend is studied by tuning the donor:acceptor ratio, with a view to understanding the recombination loss mechanisms above and below the fullerene transport percolation threshold. The internal quantum efficiency is found to be strongly correlated to the slower carrier mobility in agreement with other recent studies. Furthermore, second‐order recombination losses dominate the shape of the current density–voltage curve in efficient blend combinations, where the fullerene phase is percolated. However, below the charge transport percolation threshold, there is an electric‐field dependence of first‐order losses, which includes electric‐field‐dependent photogeneration. In the intermediate regime, the fill factor appears to be limited by both first‐ and second‐order losses. These findings provide additional basic understanding of the interplay between the bulk heterojunction morphology and the order of recombination in organic solar cells. They also shed light on the limitations of widely used transport models below the percolation threshold. 相似文献
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Hamed Azimi Alessia Senes Markus C. Scharber Kurt Hingerl Christoph J. Brabec 《Liver Transplantation》2011,1(6):1162-1168
Charge transport and recombination are studied for organic solar cells fabricated using blends of polymer poly[(4,4′‐bis(2‐ethylhexyl)dithieno[3,2‐b:2′,3′‐d]silole)‐2,6‐diyl‐alt‐(4,7‐bis(2‐thienyl)‐2,1,3‐benzothiadiazole)‐5,5′‐diyl] (Si‐PCPDTBT) with [6,6]‐phenyl‐C61‐butyric acid methyl ester (mono‐PCBM) and the bis‐adduct analogue of mono‐PCBM (bis‐PCBM). The photocurrent of Si‐PCPDTBT:bis‐PCBM devices shows a strong square root dependence on the effective applied voltage. From the relationship between the photocurrent and the light intensity, we found that the square‐root dependence of the photocurrent is governed by the mobility‐lifetime (μτ) product of charge carriers while space‐charge field effects are insignificant. The fill factor (FF) and short circuit current density (Jsc) of bis‐PCBM solar cells show a considerable increase with temperature as compared to mono‐PCBM solar cells. SCLC analysis of single carrier devices proofs that the mobility of both electrons and holes is significantly lowered when replacing mono‐PCBM with bis‐PCBM. The increased recombination in Si‐PCPDTBT:bis‐PCBM solar cells is therefore attributed to the low carrier mobilities, as the transient photovoltage measurements show that the carrier lifetime of devices are not significantly altered by using bis‐PCBM instead of mono‐PCBM. 相似文献
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John R. Tumbleston Yingchi Liu Edward T. Samulski Rene Lopez 《Liver Transplantation》2012,2(4):477-486
In this work, it is demonstrated that bimolecular recombination depends on the distance that free carriers are required to travel in transit to the electrodes in bulk heterojunction organic solar cells. By employing semi‐transparent devices, the carrier transport distance can be controlled via the local light absorption profile with an appropriate choice of the illumination side and incident wavelength. Using a series of light intensity‐dependent measurements, bimolecular recombination is shown to depend on the distance electrons or holes are required to transit the active layer. This effect is demonstrated for three different bulk heterojunction blends, where the restrictive carrier that causes the onset of recombination is identified. The mobility‐lifetime products of the limiting carriers are also estimated using a simple model for carrier extraction, where similar values are obtained regardless of the absorption profile. Implications for 1‐sun performance are also discussed, which provide guidelines for fabricating devices with thicker active layers capable of maximizing light absorption without succumbing to recombination losses. 相似文献
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Solution‐processed organic BHJ solar cells based on 3,6‐bis[5‐(benzofuran‐2‐yl)thiophen‐2‐yl]‐2,5‐bis(2‐ethylhexyl)pyrrolo[3,4‐c]pyrrole‐1,4‐dione (DPP(TBFu)2) or poly(3‐hexylthiophene) blended with [6,6]‐phenyl‐C60(70) ‐butyric acid methyl ester (PC60(70) BM) behave differently under various irradiation intensities. Small molecule‐based DPP(TBFu)2:PC60 BM solar cells show up to 5.2% power conversion efficiency and a high fill factor at low light intensity. At 100 mW cm?2 illumination, the efficiency and fill factor decrease, resulting in stronger power losses. Impedance spectroscopy at various light intensities reveals that high charge recombination is the cause of the low fill factor in DPP(TBFu)2:PC60 BM. 相似文献
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Solar Cells: Dual Interfacial Modifications Enable High Performance Semitransparent Perovskite Solar Cells with Large Open Circuit Voltage and Fill Factor (Adv. Energy Mater. 9/2017) 下载免费PDF全文
Qifan Xue Yang Bai Meiyue Liu Ruoxi Xia Zhicheng Hu Ziming Chen Xiao‐Fang Jiang Fei Huang Shihe Yang Yutaka Matsuo Hin‐Lap Yip Yong Cao 《Liver Transplantation》2017,7(9)