scholarly journals Molecular Doping for Hole Transporting Materials in Hybrid Perovskite Solar Cells

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 14 ◽  
Author(s):  
Vanira Trifiletti ◽  
Thibault Degousée ◽  
Norberto Manfredi ◽  
Oliver Fenwick ◽  
Silvia Colella ◽  
...  
Keyword(s):  
Solar Cells ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Research Field ◽  
Hole Transport ◽  
Material Structure ◽  
Stable Configuration ◽  
Oxidative Doping ◽  
Molecular Doping ◽  
Planar Heterojunction

Hybrid lead halide perovskites have been revolutionary in the photovoltaic research field, reaching efficiencies comparable with the most established photovoltaic technologies, although they have not yet reached their competitors’ stability. The search for a stable configuration requires the engineering of the charge extraction layers; in this work, molecular doping is used as an efficient method for small molecules and polymers employed as hole transport materials in a planar heterojunction configuration on compact-TiO2. We proved the viability of this approach, obtaining significantly increased performances and reduced hysteresis on compact titania-based devices. We investigated the photovoltaic performance correlated to the hole transport material structure. We have demonstrated that the molecular doping mechanism is more reliable than oxidative doping and have verified that molecular doping in polymeric hole transport materials leads to highly efficient perovskite solar cells, with long-term stability.

scholarly journals Molecular Doping for Hole Transporting Materials in Hybrid Perovskite Solar Cells

2019 ◽  
Author(s):  
Vanira Trifiletti ◽  
Thibault Degousée ◽  
Norberto Manfredi ◽  
Oliver Fenwick ◽  
Silvia Colella ◽  
...  
Keyword(s):  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Research Field ◽  
Hole Transport ◽  
Material Structure ◽  
Stable Configuration ◽  
Oxidative Doping ◽  
Hole Transporting ◽  
Molecular Doping ◽  
Planar Heterojunction

Hybrid lead halide perovskites have been revolutionary in the photovoltaic research field, reaching efficiencies comparable with the most established photovoltaic technologies, although they do not yet reach their competitor stability. The search for a stable configuration required the engineering of the charge extraction layers; in this work, molecular doping is used as an efficient method for small molecule and polymer, employed as hole transport materials in planar heterojunction configuration on compact-TiO2. We proved the viability of this approach, obtaining significantly increased performances and reduced hysteresis on compact titania-based devices. We investigated the photovoltaic performance, correlating to the hole transport material structure. We have demonstrated that the molecular doping mechanism is more reliable than the oxidative doping, and verified that molecular doping in polymeric hole transport materials leads to highly efficient perovskite solar cell, with long-term stability.

scholarly journals CuI/Spiro-OMeTAD Double-Layer Hole Transport Layer to Improve Photovoltaic Performance of Perovskite Solar Cells

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 978
Author(s):  
Chaoqun Lu ◽  
Weijia Zhang ◽  
Zhaoyi Jiang ◽  
Yulong Zhang ◽  
Cong Ni
Keyword(s):  
Solar Cells ◽  
Double Layer ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Perovskite Layer

The hole transport layer (HTL) is one of the main factors affecting the efficiency and stability of perovskite solar cells (PSCs). However, obtaining HTLs with the desired properties through current preparation techniques remains a challenge. In the present study, we propose a new method which can be used to achieve a double-layer HTL, by inserting a CuI layer between the perovskite layer and Spiro-OMeTAD layer via a solution spin coating process. The CuI layer deposited on the surface of the perovskite film directly covers the rough perovskite surface, covering the surface defects of the perovskite, while a layer of CuI film avoids the defects caused by Spiro-OMetad pinholes. The double-layer HTLs improve roughness and reduce charge recombination of the Spiro-OMeTAD layer, thereby resulting in superior hole extraction capabilities and faster hole mobility. The CuI/Spiro-OMeTAD double-layer HTLs-based devices were prepared in N2 gloveboxes and obtained an optimized PCE (photoelectric conversion efficiency) of 17.44%. Furthermore, their stability was improved due to the barrier effect of the inorganic CuI layer on the entry of air and moisture into the perovskite layer. The results demonstrate that another deposited CuI film is a promising method for realizing high-performance and air-stable PSCs.

scholarly journals The Performance Improvement of Using Hole Transport Layer with Lithium and Cobalt for Inverted Planar Perovskite Solar Cell

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 354
Author(s):  
Shaoxi Wang ◽  
He Guan ◽  
Yue Yin ◽  
Chunfu Zhang
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Perovskite Solar Cells ◽  
Hole Mobility ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Planar Heterojunction

With the continuous development of solar cells, the perovskite solar cells (PSCs), whose hole transport layer plays a vital part in collection of photogenerated carriers, have been studied by many researchers. Interface transport layers are important for efficiency and stability enhancement. In this paper, we demonstrated that lithium (Li) and cobalt (Co) codoped in the novel inorganic hole transport layer named NiOx, which were deposited onto ITO substrates via solution methods at room temperature, can greatly enhance performance based on inverted structures of planar heterojunction PSCs. Compared to the pristine NiOx films, doping a certain amount of Li and Co can increase optical transparency, work function, electrical conductivity and hole mobility of NiOx film. Furthermore, experimental results certified that coating CH3NH3PbIxCl3−x perovskite films on Li and Co- NiOx electrode interlayer film can improve chemical stability and absorbing ability of sunlight than the pristine NiOx. Consequently, the power conversion efficiency (PCE) of PSCs has a great improvement from 14.1% to 18.7% when codoped with 10% Li and 5% Co in NiOx. Moreover, the short-circuit current density (Jsc) was increased from 20.09 mA/cm2 to 21.7 mA/cm2 and the fill factor (FF) was enhanced from 0.70 to 0.75 for the PSCs. The experiment results demonstrated that the Li and Co codoped NiOx can be a effective dopant to improve the performance of the PSCs.

Surface treatment via Li-bis-(trifluoromethanesulfonyl) imide to eliminate the hysteresis and enhance the efficiency of inverted perovskite solar cells

2017 ◽  
Vol 5 (39) ◽  
pp. 10280-10287 ◽  
Author(s):  
Cong Chen ◽  
Guang Yang ◽  
Junjie Ma ◽  
Xiaolu Zheng ◽  
Zhiliang Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Surface Treatment ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Long Term Stability

We showed that perovskite solar cells employing Li-treated NiOxas a hole transport layer demonstrated excellent photovoltaic performance, and obtained a power conversion efficiency of up to 18.03%. In addition, the device possessed good long-term stability.

Perovskite solar cells with a DMSO-treated PEDOT:PSS hole transport layer exhibit higher photovoltaic performance and enhanced durability

Nanoscale ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 4236-4243 ◽  
Author(s):  
Di Huang ◽  
Tenghooi Goh ◽  
Jaemin Kong ◽  
Yifan Zheng ◽  
Suling Zhao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer

scholarly journals Effect of Annealing Process on CH3NH3PbI3-XClX Film Morphology of Planar Heterojunction Perovskite Solar Cells with Optimal Compact TiO2 Layer

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Dan Chen ◽  
Xiaoping Zou ◽  
Hong Yang ◽  
Ningning Zhang ◽  
Wenbin Jin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Annealing Temperature ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Annealing Process ◽  
Film Morphology ◽  
Perovskite Layer ◽  
Optimal Procedures ◽  
Planar Heterojunction ◽  
Annealing Method

The morphology of compact TiO2 film used as an electron-selective layer and perovskite film used as a light absorption layer in planar perovskite solar cells has a significant influence on the photovoltaic performance of the devices. In this paper, the spin coating speed of the compact TiO2 is investigated in order to get a high-quality film and the compact TiO2 film exhibits pinhole- and crack-free films treated by 2000 rpm for 60 s. Furthermore, the effect of annealing process, including annealing temperature and annealing program, on CH3NH3PbI3-XClX film morphology is studied. At the optimal annealing temperature of 100°C, the CH3NH3PbI3-XClX morphology fabricated by multistep slow annealing method has smaller grain boundaries and holes than that prepared by one-step direct annealing method, which results in the reduction of grain boundary recombination and the increase of Voc. With all optimal procedures, a planar fluorine-doped tin oxide (FTO) substrate/compact TiO2/CH3NH3PbI3-XClX/Spiro-MeOTAD/Au cell is prepared for an active area of 0.1 cm2. It has achieved a power conversion efficiency (PCE) of 14.64%, which is 80.3% higher than the reference cell (8.12% PCE) without optimal perovskite layer. We anticipate that the annealing process with optimal compact TiO2 layer would possibly become a promising method for future industrialization of planar perovskite solar cells.

Enhancing the photovoltaic performance of planar heterojunction perovskite solar cells by doping the perovskite layer with alkali metal ions

2016 ◽  
Vol 4 (42) ◽  
pp. 16546-16552 ◽  
Author(s):  
Jingjing Chang ◽  
Zhenhua Lin ◽  
Hai Zhu ◽  
Furkan Halis Isikgor ◽  
Qing-Hua Xu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Alkali Metal ◽  
Metal Ions ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Alkali Metal Ions ◽  
Perovskite Layer ◽  
Photovoltaic Efficiency ◽  
Planar Heterojunction

Doping the perovskite layer with a small amount of alkali metal ions can enhance the photovoltaic efficiency of perovskite solar cells.

scholarly journals The Way to Pursue Truly High-Performance Perovskite Solar Cells

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1269 ◽  
Author(s):  
Wu ◽  
Thakur ◽  
Chiang ◽  
Chandel ◽  
Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Hot Electrons ◽  
Electron Transport Layer ◽  
Hole Transport Layer ◽  
Hot Carriers ◽  
Potential Loss

The power conversion efficiency (PCE) of single-junction solar cells was theoretically predicted to be limited by the Shockley–Queisser limit due to the intrinsic potential loss of the photo-excited electrons in the light absorbing materials. Up to now, the optimized GaAs solar cell has the highest PCE of 29.1%, which is close to the theoretical limit of ~33%. To pursue the perfect photovoltaic performance, it is necessary to extend the lifetimes of the photo-excited carriers (hot electrons and hot holes) and to collect the hot carriers without potential loss. Thanks to the long-lived hot carriers in perovskite crystal materials, it is possible to completely convert the photon energy to electrical power when the hot electrons and hot holes can freely transport in the quantized energy levels of the electron transport layer and hole transport layer, respectively. In order to achieve the ideal PCE, the interactions between photo-excited carriers and phonons in perovskite solar cells has to be completely understood.

Efficient inverted planar perovskite solar cells based on inorganic hole-transport layers from nickel-containing organic sol

2019 ◽  
Vol 12 (01) ◽  
pp. 1850088 ◽  
Author(s):  
Weina Zhang ◽  
Jie Tang ◽  
Jihuai Wu ◽  
Zhang Lan
Keyword(s):  
Solar Cells ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Simple Solution ◽  
Hole Transport Layer ◽  
Solution Processed ◽  
Transport Dynamics ◽  
Nio Nanocrystals

Due to the rough surface of fluorine-doped tin oxide (FTO) conductive glasses, it is challenging to fabricate fully covered ultra-thin hole-transport layer (HTL) with thickness under 100[Formula: see text]nm by a simple solution-processed method. Yet, the quality of HTLs play a key role in determining photovoltaic performance of the inverted planar perovskite solar cells (PSCs) owing to their important functions for effectively extracting holes, blocking electrons, suppressing dark reaction, and so on. Here, we report a facile nickel-containing organic sol (Ni–Sol) route to fabricate fully covered 46[Formula: see text]nm thick NiO HTLs for efficient inverted planar PSCs. Comparing with the pre-synthesized NiO nanocrystals solution, the Ni–Sol is easier to spread around the rough outline of FTO to achieve higher surface coverage. Through optimizing the concentration of nickel-containing organic sol, the champion performance of the inverted planar PSCs can be achieved because of the high transparency and good hole-transport dynamics of the optimized NiO film. This work demonstrates the advanced Ni–Sol route for preparing efficient inverted planar PSCs by the simple solution-processed method.

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