scholarly journals Dopant-Free All-Organic Small-Molecule HTMs for Perovskite Solar Cells: Concepts and Structure–Property Relationships

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2279
Author(s):  
Mohamed M. H. Desoky ◽  
Matteo Bonomo ◽  
Roberto Buscaino ◽  
Andrea Fin ◽  
Guido Viscardi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Perovskite Solar Cells ◽  
Structure Property ◽  
Perovskite Layer ◽  
Structure Property Relationships ◽  
Hole Transporting ◽  
Small Set ◽  
Almost All

Since the introduction of Perovskite Solar Cells, their photovoltaic efficiencies have grown impressively, reaching over 25%. Besides the exceptional efficiencies, those solar cells need to be improved to overcome some concerns, such as their intrinsic instability when exposed to humidity. In this respect, the development of new and stable Hole Transporting Materials (HTMs) rose as a new hot topic. Since the doping agents for common HTM are hygroscopic, they bring water in contact with the perovskite layer, thus deteriorating it. In the last years, the research focused on “dopant-free” HTMs, which are inherently conductive without any addition of dopants. Dopant-free HTMs, being small molecules or polymers, have still been a relatively small set of compounds until now. This review collects almost all the relevant organic dopant-free small-molecule HTMs known so far. A general classification of HTMs is proposed, and structure analysis is used to identify structure–property relationships, to help researchers to build better-performing materials.

Star-shaped cyclopentadithiophene-based dopant-free hole-transporting material for high-performance perovskite solar cells

2021 ◽  
Author(s):  
Kun-Mu Lee ◽  
Jui-Yu Yang ◽  
Ping-Sheng Lai ◽  
Ke-Jyun Luo ◽  
Ting Yu Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Free Hole ◽  
Hole Transporting ◽  
Hole Transporting Material

A new cyclopentadithiophene (CPDT)-based organic small molecule serves as an efficient dopant-free hole transporting material (HTM) for perovskite solar cells (PSCs). Upon incorporation of two carbazole groups, the resulting CPDT-based...

Effect of core engineering on triphenylamine derivative-based dopant-free hole-transporting materials for perovskite solar cells: from theoretical calculation to experimental research

2021 ◽  
Author(s):  
Qian Chen ◽  
Puhang Chen ◽  
Hongyuan Liu ◽  
Xiaorui Liu
Keyword(s):  
Solar Cells ◽  
Theoretical Calculation ◽  
Small Molecule ◽  
Experimental Research ◽  
Perovskite Solar Cells ◽  
Free Hole ◽  
High Efficient ◽  
Hole Transporting ◽  
Hole Transporting Materials ◽  
Triphenylamine Derivative

Computational actuation on design of small-molecule triphenylamine derivative-based hole-transporting materials (HTMs) is a high-efficient way to acquire potential HTMs for perovskite solar cells (PSCs). In the work, on basis of...

Understanding Structure–Property Relationships in All-Small-Molecule Solar Cells Incorporating a Fullerene or Nonfullerene Acceptor

2018 ◽  
Vol 10 (42) ◽  
pp. 36037-36046 ◽  
Author(s):  
Jisu Hong ◽  
Min Jae Sung ◽  
Hyojung Cha ◽  
Chan Eon Park ◽  
James R. Durrant ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Nonfullerene Acceptor

Boosting the performance of D–A–D type hole-transporting materials for perovskite solar cells via tuning the acceptor group

2020 ◽  
Vol 44 (35) ◽  
pp. 15244-15250
Author(s):  
Zhu-Zhu Sun ◽  
Mengyao Hao ◽  
Shuai Feng ◽  
Wei-Lu Ding ◽  
Xing-Liang Peng
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Perovskite Solar Cells ◽  
Acceptor Group ◽  
Hole Transporting ◽  
Hole Transporting Materials

Phenanthrothiadiazole (PT) and triphenylenobisthiadiazole (TBT) are proposed as the acceptor groups of D–A–D-type HTMs, and compared with the benzothiadiazole (BT) unit, three small molecule HTMs are investigated theoretically.

scholarly journals Powder Pressed Cuprous Iodide (CuI) as A Hole Transporting Material for Perovskite Solar Cells

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2037 ◽  
Author(s):  
Siva Uthayaraj ◽  
D. Karunarathne ◽  
G. Kumara ◽  
Thanihaichelvan Murugathas ◽  
Shivatharsiny Rasalingam ◽  
...  
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Perovskite Solar Cells ◽  
Powder Layer ◽  
Perovskite Layer ◽  
Pressing Method ◽  
Air Mass ◽  
Hole Transporting ◽  
Top Contact ◽  
Hole Transporting Material

This study focuses on employing cuprous iodide (CuI) as a hole-transporting material (HTM) in fabricating highly efficient perovskite solar cells (PSCs). The PSCs were made in air with either CuI or 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) as HTMs. A simple and novel pressing method was employed for incorporating CuI powder layer between perovskite layer and Pt top-contact to fabricate devices with CuI, while spiro-OMeTAD was spin-coated between perovskite layer and thermally evaporated Au top-contact to fabricate devices with spiro-OMeTAD. Under illuminations of 100 mW/cm2 with an air mass (AM) 1.5 filter in air, the average short-circuit current density (JSC) of the CuI devices was over 24 mA/cm2, which is marginally higher than that of spiro-OMeTAD devices. Higher JSC of the CuI devices can be attributed to high hole-mobility of CuI that minimizes the electron-hole recombination. However, the average power conversion efficiency (PCE) of the CuI devices were lower than that of spiro-OMeTAD devices due to slightly lower open-circuit voltage (VOC) and fill factor (FF). This is probably due to surface roughness of CuI powder. However, optimized devices with solvent-free powder pressed CuI as HTM show a promising efficiency of over 8.0 % under illuminations of 1 sun (100 mW/cm2) with an air mass 1.5 filter in air, which is the highest among the reported efficiency values for PSCs fabricated in an open environment with CuI as HTM.

A review of organic small molecule-based hole-transporting materials for meso-structured organic–inorganic perovskite solar cells

2016 ◽  
Vol 4 (41) ◽  
pp. 15788-15822 ◽  
Author(s):  
Chin Hoong Teh ◽  
Rusli Daik ◽  
Eng Liang Lim ◽  
Chi Chin Yap ◽  
Mohd Adib Ibrahim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Core Structure ◽  
Intrinsic Conductivity ◽  
Inorganic Perovskite ◽  
Hole Transporting ◽  
Hole Transporting Materials

HTMs with a planar core structure, extended-π system and electron-rich groups exhibited better intrinsic conductivity, which enhanced the photovoltaic performance.

scholarly journals Structural and Electrical Investigation of Cobalt-Doped NiOx/Perovskite Interface for Efficient Inverted Solar Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 872 ◽  
Author(s):  
Zahra Rezay Marand ◽  
Ahmad Kermanpur ◽  
Fathallah Karimzadeh ◽  
Eva M. Barea ◽  
Ehsan Hassanabadi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
Perovskite Solar Cells ◽  
Synthesis Temperature ◽  
Strong Impact ◽  
Perovskite Layer ◽  
Co Doping ◽  
Beneficial Effects ◽  
Hole Transporting ◽  
Interfacial Recombination

Inorganic hole-transporting materials (HTMs) for stable and cheap inverted perovskite-based solar cells are highly desired. In this context, NiOx, with low synthesis temperature, has been employed. However, the low conductivity and the large number of defects limit the boost of the efficiency. An approach to improve the conductivity is metal doping. In this work, we have synthesized cobalt-doped NiOx nanoparticles containing 0.75, 1, 1.25, 2.5, and 5 mol% cobalt (Co) ions to be used for the inverted planar perovskite solar cells. The best efficiency of the devices utilizing the low temperature-deposited Co-doped NiOx HTM obtained a champion photoconversion efficiency of 16.42%, with 0.75 mol% of doping. Interestingly, we demonstrated that the improvement is not from an increase of the conductivity of the NiOx film, but due to the improvement of the perovskite layer morphology. We observe that the Co-doping raises the interfacial recombination of the device but more importantly improves the perovskite morphology, enlarging grain size and reducing the density of bulk defects and the bulk recombination. In the case of 0.75 mol% of doping, the beneficial effects do not just compensate for the deleterious one but increase performance further. Therefore, 0.75 mol% Co doping results in a significant improvement in the performance of NiOx-based inverted planar perovskite solar cells, and represents a good compromise to synthesize, and deposit, the inorganic material at low temperature, without losing the performance, due to the strong impact on the structural properties of the perovskite. This work highlights the importance of the interface from two different points of view, electrical and structural, recognizing the role of a low doping Co concentration, as a key to improve the inverted perovskite-based solar cells’ performance.

Imidazole core to construct dopant-free asymmetric hole-transporting material for efficient inverted perovskite solar cells

2021 ◽  
Author(s):  
Yang Cheng ◽  
Quanping Wu ◽  
Ming Luo ◽  
Haolin Wang ◽  
Song Xue ◽  
...  
Keyword(s):  
Solar Cells ◽  
Direct Contact ◽  
Bottom Electrode ◽  
Perovskite Solar Cells ◽  
Perovskite Layer ◽  
Hole Transporting ◽  
Hole Transporting Material ◽  
Hole Transporting Materials

As the sandwiched hole transporting materials (HTMs) layers are in direct contact with up-coated perovskite layer and bottom electrode in p-i-n structured perovskite (i-PSCs), the film quality of HTMs determines...

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