Ultrathin PTAA interlayer in conjunction with azulene derivatives for the fabrication of inverted perovskite solar cells

In recent years, poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA)‐based inverted perovskite solar cells (IPSCs) have gained tremendous attention due to their simple device structure, easy fabrication process, and suitability for roll‐to‐roll process for fabricating flexible devices. With the recent years’ rapid progress, PTAA‐IPSCs have achieved higher efficiency than other IPSCs, revealing great potential for future applications. Among various strategies to enhance the performance of PTAA‐IPSCs, interfacial engineering has been highlighted with comprehensive merits, including improving the wettability of PTAA, enhancing the crystallinity of perovskite, modifying energy levels, and reducing defect traps at interfaces for enhancing charge transfer and reducing nonradiative recombination. Although extensive review articles have been published on PSCs, little attention has been focused on interfacial engineering of PTAA‐IPSCs. It is believed that it is of great importance to summarize the fruitful breakthroughs in recent years in this area and give some prospective. In this review, the development of PTAA‐IPSCs is summarized, and then interfacial engineering processes on perovskite, PTAA, and electron transport layer is systematically discussed, respectively. In addition, current challenges associated with the rapid developments in the field of PTAA‐IPSC have been pointed out and insightful outlooks for the future design and commercial development of PTAA‐IPSCs have been provided.

show abstract

“…The biAz‐4TPA/PTAA bilayer leads to favorable energy‐level alignment that enhances the holes extraction process. [ 146 ]…”

Section: Engineering At Ptaa/perovskite Interfacementioning

confidence: 99%

Interfacial Engineering for High‐Performance PTAA‐Based Inverted 3D Perovskite Solar Cells

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In recent years, it was found that the ultrathin PTAA polymers can be used to modify the surface of a roughed ITO thin film as the anode electrode, which can result in the high PCE of 18.11% [ 147 ]. The PCE of the ultrathin-PTAA-based inverted perovskite solar cells can be increased to be higher than 21% when the surface of the hydrophobic PTAA polymers is modified by using the bipolar organic molecules, such as PEAI and 3-(1-pyridinio)-i-propanesulfonate (PPS) [ 148 , 149 ].…”

Section: Understanding Of Highly-efficient Inverted Perovskite Solar ...mentioning

confidence: 99%

Understanding the PEDOT:PSS, PTAA and P3CT-X Hole-Transport-Layer-Based Inverted Perovskite Solar Cells

Lin

et al. 2022

Polymers

View full text Add to dashboard Cite

The power conversion efficiencies (PCEs) of metal-oxide-based regular perovskite solar cells have been higher than 25% for more than 2 years. Up to now, the PCEs of polymer-based inverted perovskite solar cells are widely lower than 23%. PEDOT:PSS thin films, modified PTAA thin films and P3CT thin films are widely used as the hole transport layer or hole modification layer of the highlyefficient inverted perovskite solar cells. Compared with regular perovskite solar cells, polymer-based inverted perovskite solar cells can be fabricated under relatively low temperatures. However, the intrinsic characteristics of carrier transportation in the two types of solar cells are different, which limits the photovoltaic performance of inverted perovskite solar cells. Thanks to the low activation energies for the formation of high-quality perovskite crystalline thin films, it is possible to manipulate the optoelectronic properties by controlling the crystal orientation with the different polymer-modified ITO/glass substrates. To achieve the higher PCE, the effects of polymer-modified ITO/glass substrates on the optoelectronic properties and the formation of perovskite crystalline thin films have to be completely understood simultaneously.

show abstract

“…13 On the other hand, its highly hydrophobic properties will reduce the repeatability of the perovskite devices and cause pinholes after depositing the perovskite layer. 14,15 Self-assembled molecules (SAMs) have recently been used in p-i-n PSCs as HSLs, because of the advantages of cost-effectiveness, stability, and absence of additives. 16−18 Additionally, SAMs provide large-scale deposition capability due to their capacity to use different types of deposition techniques.…”

Section: ■ Introductionmentioning

confidence: 99%

“…A Poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA) layer is widely used as an HSL in p-i-n configuration PSCs, and its highly hydrophobic properties lead to increased perovskite grain sizes and directly affect the performance of the perovskite devices . On the other hand, its highly hydrophobic properties will reduce the repeatability of the perovskite devices and cause pinholes after depositing the perovskite layer. , Self-assembled molecules (SAMs) have recently been used in p-i-n PSCs as HSLs, because of the advantages of cost-effectiveness, stability, and absence of additives. − Additionally, SAMs provide large-scale deposition capability due to their capacity to use different types of deposition techniques. SAMs typically consist of the following three groups: an anchoring group that connects the small molecules to the metal oxide surface via chemical bonding, a spacer that controls the packing geometry, and a terminal group that adjusts the surface and interface properties. − The control of interface properties has drawn attention due to improvement of the charge extraction with better energy alignment and reduced trap density. , Moreover, the terminal group determines the wettability of the SAMs which affects the grain size and consequently the grain boundaries of the perovskite layer .…”

Section: Introductionmentioning

confidence: 99%

Role of Terminal Group Position in Triphenylamine-Based Self-Assembled Hole-Selective Molecules in Perovskite Solar Cells

Aktas

Pudi

Phung

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The application of self-assembled molecules (SAMs) as a charge selective layer in perovskite solar cells has gained tremendous attention. As a result, highly efficient and stable devices have been released with stand-alone SAMs binding ITO substrates. However, further structural understanding of the effect of SAM in perovskite solar cells (PSCs) is required. Herein, three triphenylamine-based molecules with differently positioned methoxy substituents have been synthesized that can self-assemble onto the metal oxide layers that selectively extract holes. They have been effectively employed in p-i-n PSCs with a power conversion efficiency of up to 20%. We found that the perovskite deposited onto SAMs made by para-and ortho-substituted hole selective contacts provides large grain thin film formation increasing the power conversion efficiencies. Density functional theory predicts that para-and ortho-substituted position SAMs might form a well-ordered structure by improving the SAM's arrangement and in consequence enhancing its stability on the metal oxide surface. We believe this result will be a benchmark for the design of further SAMs.

show abstract

Ultrathin PTAA interlayer in conjunction with azulene derivatives for the fabrication of inverted perovskite solar cells

Abstract: Perovskite solar cells (PSCs) have reshaped the thin-film photovoltaic technology owning to their exceptional high power conversion efficiency (PCE) in conjunction with their low-cost and facile production. PSCs are fabricated...

Cited by 22 publications

References 58 publications

Interfacial Engineering for High‐Performance PTAA‐Based Inverted 3D Perovskite Solar Cells

Interfacial Engineering for High‐Performance PTAA‐Based Inverted 3D Perovskite Solar Cells

Understanding the PEDOT:PSS, PTAA and P3CT-X Hole-Transport-Layer-Based Inverted Perovskite Solar Cells

Role of Terminal Group Position in Triphenylamine-Based Self-Assembled Hole-Selective Molecules in Perovskite Solar Cells

Contact Info

Product

Resources

About