scholarly journals Switching Off Hysteresis in Perovskite Solar Cells by Fine-Tuning Energy Levels of Extraction Layers

2018 ◽  
Vol 8 (21) ◽  
pp. 1703376 ◽  
Author(s):  
Antonio Guerrero ◽  
Agustín Bou ◽  
Gebhard Matt ◽  
Osbel Almora ◽  
Thomas Heumüller ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Levels ◽  
Perovskite Solar Cells ◽  
Fine Tuning

scholarly journals Progress on the Synthesis and Application of CuSCN Inorganic Hole Transport Material in Perovskite Solar Cells

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2592 ◽  
Author(s):  
Funeka Matebese ◽  
Raymond Taziwa ◽  
Dorcas Mutukwa
Keyword(s):  
Solar Cells ◽  
Energy Levels ◽  
Perovskite Solar Cells ◽  
Hole Mobility ◽  
Cost Effective ◽  
Vital Role ◽  
Hole Transport ◽  
Recombination Processes ◽  
Short Synthesis ◽  
P Type

P-type wide bandgap semiconductor materials such as CuI, NiO, Cu2O and CuSCN are currently undergoing intense research as viable alternative hole transport materials (HTMs) to the spiro-OMeTAD in perovskite solar cells (PSCs). Despite 23.3% efficiency of PSCs, there are still a number of issues in addition to the toxicology of Pb such as instability and high-cost of the current HTM that needs to be urgently addressed. To that end, copper thiocyanate (CuSCN) HTMs in addition to robustness have high stability, high hole mobility, and suitable energy levels as compared to spiro-OMeTAD HTM. CuSCN HTM layer use affordable materials, require short synthesis routes, require simple synthetic techniques such as spin-coating and doctor-blading, thus offer a viable way of developing cost-effective PSCs. HTMs play a vital role in PSCs as they can enhance the performance of a device by reducing charge recombination processes. In this review paper, we report on the current progress of CuSCN HTMs that have been reported to date in PSCs. CuSCN HTMs have shown enhanced stability when exposed to weather elements as the solar devices retained their initial efficiency by a greater percentage. The efficiency reported to date is greater than 20% and has a potential of increasing, as well as maintaining thermal stability.

scholarly journals Substituents interplay in piperidinyl-perylenediimide as dopant-free hole-selective layer for perovskite solar cells fabrication

2021 ◽  
Author(s):  
David Payno ◽  
Manuel Salado ◽  
Michael Andresini ◽  
David Gutiérrez-Moreno ◽  
Peng Huang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Performance Enhancement ◽  
Twist Angle ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Fine Tuning ◽  
Free Hole ◽  
Selective Layer ◽  
Energetic Level

AbstractThe charge selective layer is of significance for the fabrication of emerging photovoltaics, including perovskite-based solar cells. Molecular hole transport materials (HTMs) are being employed as charge transporters, owing to their synthetic molecular flexibility that allows the fine-tuning of their electro-optical properties. Typically, doping of HTMs is essential, but it is a trade-off between long-term durability and device performance. The energetic level of perylenediimides (PDIs) was altered by the position of the substituent. The substituent’s position influences the geometry of the PDI core, which can lose planarity, thus presenting a core twist angle between the two naphthalene subunits to find its application as hole-selective layers for fabrication. We have fabricated perovskite solar cells, with pristine PDI, and it gave a competitive performance. New design protocols for PDIs are required for aligned energetic levels, which will minimize recombination losses in solar cells, favoring a performance enhancement. Graphical abstract

scholarly journals Efficient Solution Processed CH3NH3PbI3 Perovskite Solar Cells with PolyTPD Hole Transport Layer

2019 ◽  
Vol 74 (8) ◽  
pp. 665-672 ◽  
Author(s):  
Julian Höcker ◽  
David Kiermasch ◽  
Philipp Rieder ◽  
Kristofer Tvingstedt ◽  
Andreas Baumann ◽  
...  
Keyword(s):  
Solar Cells ◽  
Surface Coverage ◽  
Energy Levels ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Perovskite Layer ◽  
Solvent Engineering ◽  
Highest Occupied Molecular Orbital

AbstractThe organic and hydrophobic polymer poly[N, N′-bis(4-butilphenyl)-N, N′-bis(phenyl)-benzidine] (polyTPD) represents a promising hole transport layer (HTL) for perovskite photovoltaics due to its suitable energy levels, whereby its highest occupied molecular orbital level matches well with the valence band level of methylammonium lead triiodide (CH3NH3PbI3, MAPbI3) perovskite. However, processing a perovskite layer from the solution on the surface of this organic material, is found to be difficult due to the surface properties of the latter. In this study, we evaluate efficient p-i-n type MAPbI3 perovskite solar cells employing differently processed polyTPD layers. We found that the surface coverage of the MAPbI3 perovskite layer strongly depends on the preparation method of the underlying polyTPD layer. By varying the solvents for the polyTPD precursor, its concentration, and by applying an optimised two-step perovskite deposition technique we increased both the surface coverage of the perovskite layer as well as the power conversion efficiency (PCE) of the corresponding solar cell devices. Our simple solvent-engineering approach demonstrates that no further interface modifications are needed for a successful preparation of efficient planar photovoltaic devices with PCEs in the range of 15 %–16 %.

scholarly journals Fine-Tuning Energy Levels via Asymmetric End Groups Enables Polymer Solar Cells with Efficiencies over 17%

Joule ◽  
2020 ◽  
Vol 4 (6) ◽  
pp. 1236-1247 ◽  
Author(s):  
Zhenghui Luo ◽  
Ruijie Ma ◽  
Tao Liu ◽  
Jianwei Yu ◽  
Yiqun Xiao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
Fine Tuning ◽  
End Groups

scholarly journals Hexaazatrinaphthylene Derivatives: Efficient Electron-Transporting Materials with Tunable Energy Levels for Inverted Perovskite Solar Cells

2016 ◽  
Vol 128 (31) ◽  
pp. 9145-9149 ◽  
Author(s):  
Dongbing Zhao ◽  
Zonglong Zhu ◽  
Ming-Yu Kuo ◽  
Chu-Chen Chueh ◽  
Alex K.-Y. Jen
Keyword(s):  
Solar Cells ◽  
Energy Levels ◽  
Perovskite Solar Cells

Mechanism of biphasic charge recombination and accumulation in TiO2mesoporous structured perovskite solar cells

2016 ◽  
Vol 18 (17) ◽  
pp. 12128-12134 ◽  
Author(s):  
Hao-Yi Wang ◽  
Yi Wang ◽  
Man Yu ◽  
Jun Han ◽  
Zhi-Xin Guo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Levels ◽  
Perovskite Solar Cells ◽  
Charge Recombination ◽  
Recombination Process

The charge recombination process is dominated by perovskite or mesoporous TiO2owing to different charge populations at various energy levels.

Energy level-modulated non-fullerene small molecule acceptors for improved VOC and efficiency of inverted perovskite solar cells

2019 ◽  
Vol 7 (7) ◽  
pp. 3336-3343 ◽  
Author(s):  
Xiaohui Liu ◽  
Xiaodong Li ◽  
Yang Zou ◽  
He Liu ◽  
Lei Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Small Molecule ◽  
Energy Levels ◽  
Perovskite Solar Cells

The efficiency and VOC of inverted perovskite solar cells are regularly improved by non-fullerene small molecule acceptors with modulated energy levels.

Side-Chain Engineering for Fine-Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

2014 ◽  
Vol 4 (10) ◽  
pp. 1400087 ◽  
Author(s):  
Jaewon Lee ◽  
Min Kim ◽  
Boseok Kang ◽  
Sae Byeok Jo ◽  
Heung Gyu Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
Fine Tuning ◽  
Side Chain ◽  
Nanoscale Morphology

scholarly journals A partially-planarised hole-transporting quart-p-phenylene for perovskite solar cells

2019 ◽  
Vol 7 (15) ◽  
pp. 4332-4335
Author(s):  
Juan P. Mora-Fuentes ◽  
Diego Cortizo-Lacalle ◽  
Silvia Collavini ◽  
Karol Strutyński ◽  
Wolfgang R. Tress ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Energy Levels ◽  
Perovskite Solar Cells ◽  
Perovskite Solar Cell ◽  
Optimal Energy ◽  
Hole Transporting ◽  
Hole Transporting Material

Herein, we describe the synthesis of a hole transporting material based on a partially planarised quart-p-phenylene core incorporating tetraketal and diphenylamine substituents that show optimal energy levels and solubility for perovskite solar cell applications.

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