Synthesis of oriented TiO2 nanocones with fast charge transfer for perovskite solar cells

Zhong, Dong; Cai, Bing; Wang, Xiuli; Yang, Zhou; Xing, Yedi; Miao, Song; Zhang, Wen−Hua; Li, Can

doi:10.1016/j.nanoen.2014.11.014

Cited by 185 publications

(147 citation statements)

References 54 publications

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“…[81] The surface modification was developed as an efficient method to promote the ultrafast interfacial charge extraction. [82][83][84][85][86] In one of our former works, we used carbon quantum dots, which acted as superfast electron tunnel, to modify the interface between ETM and perovskite, resulting in an accelerated charge extraction process which increased the extraction rate from ≈300 ps to just around 100 ps. [83] Compared with the charge extraction process, charge transfer and recombination at the interface have a much stronger impact on the device performance like V oc and J sc .…”

Section: Charge Dynamicsmentioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

374

265

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Organic‐inorganic halide perovskite materials have become a shining star in the photovoltaic field due to their unique properties, such as high absorption coefficient, optimal bandgap, and high defect tolerance, which also lead to the breathtaking increase in power conversion efficiency from 3.8% to over 22% in just seven years. Although the highest efficiency was obtained from the TiO2 mesoporous structure, there are increasing studies focusing on the planar structure device due to its processibility for large‐scale production. In particular, the planar p‐i‐n structure has attracted increasing attention on account of its tremendous advantages in, among other things, eliminating hysteresis alongside a competitive certified efficiency of over 20%. Crucial for the device performance enhancement has been the interface engineering for the past few years, especially for such planar p‐i‐n devices. The interface engineering aims to optimize device properties, such as charge transfer, defect passivation, band alignment, etc. Herein, recent progress on the interface engineering of planar p‐i‐n structure devices is reviewed. This review is mainly focused on the interface design between each layer in p‐i‐n structure devices, as well as grain boundaries, which are the interfaces between polycrystalline perovskite domains. Promising research directions are also suggested for further improvements.

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Section: Charge Dynamicsmentioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

374

265

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“…Metal oxides such as TiO 2 , [ 29,30 ] ZnO, [ 31 ] and SnO 2 [ 32 ] are n-type semiconductors that had been widely employed as ETL in conventional type PVKSCs. The choice of ETL for inverted type PVKSCs is even more limited, fullerene and its derivatives, such as PCBM, are so far the most promising ETLs and have been exclusively used in inverted PVKSCs.…”

Section: Introductionmentioning

confidence: 99%

Amino‐Functionalized Conjugated Polymer as an Efficient Electron Transport Layer for High‐Performance Planar‐Heterojunction Perovskite Solar Cells

Sun

Yip

et al. 2015

Advanced Energy Materials

310

188

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An amino‐functionalized copolymer with a conjugated backbone composed of fluorene, naphthalene diimide, and thiophene spacers (PFN‐2TNDI) is introduced as an alternative electron transport layer (ETL) to replace the commonly used [6,6]‐Phenyl‐C61‐butyric acid methyl ester (PCBM) in the p–i–n planar‐heterojunction organometal trihalide perovskite solar cells. A combination of characterizations including photoluminescence (PL), time‐resolved PL decay, Kelvin probe measurement, and impedance spectroscopy is used to study the interfacial effects induced by the new ETL. It is found that the amines on the polymer side chains not only can passivate the surface traps of perovskite to improve the electron extraction properties, they also can reduce the work function of the metal cathode by forming desired interfacial dipoles. With these dual functionalities, the resulted solar cells outperform those based on PCBM with power conversion efficiency (PCE) increased from 12.9% to 16.7% based on PFN‐2TNDI. In addition to the performance enhancement, it is also found that a wide range of thicknesses of the new ETL can be applied to produce high PCE devices owing to the good electron transport property of the polymer, which offers a better processing window for potential fabrication of perovskite solar cells using large‐area coating method.

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“…Zhong et al [49] prepared single-crystalline rutile TiO2 nanocones with adjustable length. Applied the materials into MPSC, the cell yields 11.9% PCE, which is superior to the control cell (10% for TiO2 nanorods and 11% for ZnO nanorods, respectively).…”

Section: Methodsmentioning

confidence: 99%

N-type metal-oxide electron transport layer for mesoscopic perovskite solar cells

et al. 2016

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Synthesis of oriented TiO2 nanocones with fast charge transfer for perovskite solar cells

Cited by 185 publications

References 54 publications

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Amino‐Functionalized Conjugated Polymer as an Efficient Electron Transport Layer for High‐Performance Planar‐Heterojunction Perovskite Solar Cells

N-type metal-oxide electron transport layer for mesoscopic perovskite solar cells

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