Surface-tension release in PTAA-based inverted perovskite solar cells

Xu, Jie; Dai, Jinfei; Dong, Hua; Li, Pei‐Zhou; Chen, Jinbo; Zhu, Xinyi; Wang, Zhenxiao; Jiao, Bo; Hou, Xun; Li, Jingrui

doi:10.1016/j.orgel.2021.106378

Cited by 27 publications

(19 citation statements)

References 37 publications

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“…It shows a hole mobility of (3-6) × 10 −4 cm 2 V −1 s −1 tested by the SCLC method with HOMO and LUMO energy levels of −5.2 and −1.8 to −1.7 eV, respectively. [84,105,106] The uniformly smooth films and absence of microstructural ordering after annealing reduce recombination at the HTL/perovskite interface. Meanwhile, the high hydrophobicity is beneficial for the stability of the devices.…”

Section: Poly(bis(4-phenyl)(246-trimethylphenyl)amine (Ptaa)mentioning

confidence: 99%

“…[107,108] Despite the nonwetting surface, high-quality perovskite thin films can be prepared due to the smooth surface. [109] Miyano and co-workers [106] reported how PTAA improved the interface quality and carrier-transport efficacy, resulting in enhanced performance of PTAA devices (18.1%), compared to PEDOT:PSS references (14.5%). De Wolf and co-workers [110] used DMF/n-methyl-2-pyrrolidone (NMP) instead of DMF/dimethyl sulfoxide (DMSO) as a cosolvent system to enhance the wettability of perovskite precursor inks on PTAA.…”

Section: Poly(bis(4-phenyl)(246-trimethylphenyl)amine (Ptaa)mentioning

confidence: 99%

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Organic Hole‐Transport Layers for Efficient, Stable, and Scalable Inverted Perovskite Solar Cells

et al. 2022

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Hole-transporting layers (HTLs) are an essential component in inverted, p-i-n perovskite solar cells (PSCs) where they play a decisive role in extraction and transport of holes, surface passivation, perovskite crystallization, device stability, and cost. Currently, the exploration of efficient, stable, highly transparent and low-cost HTLs is of vital importance for propelling p-i-n PSCs toward commercialization. Compared to their inorganic counterparts, organic HTLs offer multiple advantages such as a tunable bandgap and energy level, easy synthesis and purification, solution processability, and overall low cost. Here, recent progress of organic HTLs, including conductive polymers, small molecules, and self-assembled monolayers, as utilized in inverted PSCs is systematically reviewed and summarized. Their molecular structure, hole-transport properties, energy levels, and relevant device properties and resulting performances are presented and analyzed. A summary of design principles and a future outlook toward highly efficient organic HTLs in inverted PSCs is proposed. This review aims to inspire further innovative development of novel organic HTLs for more efficient, stable, and scalable inverted PSCs.

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Section: Poly(bis(4-phenyl)(246-trimethylphenyl)amine (Ptaa)mentioning

confidence: 99%

Section: Poly(bis(4-phenyl)(246-trimethylphenyl)amine (Ptaa)mentioning

confidence: 99%

Organic Hole‐Transport Layers for Efficient, Stable, and Scalable Inverted Perovskite Solar Cells

et al. 2022

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“…[ 129 ] Xu et al applied potassium fluoride (KF) as buffer layer on PTAA and fabricated device with efficiency up to 21.51%. [ 130 ] The KF treatment downward shifts the VBM of the polymer toward the VBM of perovskite, making hole extraction much easier. Moreover, the surface tension of PTAA is released, facilitating perovskite films much easier to be spin‐coated and crystallized.…”

Section: Engineering At Ptaa/perovskite Interfacementioning

confidence: 99%

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

et al. 2022

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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.

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“…The improved wettability is beneficial to the growth of perovskite film. [27][28][29][30][31] The thicknesses of three substrates were tested by the surface profilometer. Figure S1 Small 2022, 18, 2203536 (Supporting Information) exhibits the representative profiles.…”

Section: Film Structurementioning

confidence: 99%

Passivating Defects at the Bottom Interface of Perovskite by Ethylammonium to Improve the Performance of Perovskite Solar Cells

Ren

Liu

et al. 2022

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The interface of perovskite solar cells (PSCs) plays a significant role in influencing their performance, yet there is still scarce research focusing on their difficult‐to‐expose bottom interfaces. Herein, ethylammonium bromide (EABr) is introduced into the bottom interface and its passivation effects are studied directly. First, EABr can improve substrate wettability, which is beneficial for the perovskite‐film deposition. By lifting off the perovskite film spontaneously from the substrate, it is found that EABr can significantly reduce the amount of unreacted PbI2 at the bottom interface. These PbI2 crystals have been recently identified as a major defect source and degradation site for perovskite film. Meanwhile, EABr also lifts the valence band maximum at the bottom side of perovskite from ‐5.38 to ‐5.09 eV, facilitating better hole transfer. Such a improvement is also verified by the study of charge carrier dynamics. Through introducing EABr, all photovoltaic parameters of the inverted PSCs are improved, and their power conversion efficiency (PCE) increases from 20.41% to 21.06%. The study highlights the importance of direct characterization of the bottom interface for a better passivation effect.

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Surface-tension release in PTAA-based inverted perovskite solar cells

Cited by 27 publications

References 37 publications

Organic Hole‐Transport Layers for Efficient, Stable, and Scalable Inverted Perovskite Solar Cells

Organic Hole‐Transport Layers for Efficient, Stable, and Scalable Inverted Perovskite Solar Cells

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

Passivating Defects at the Bottom Interface of Perovskite by Ethylammonium to Improve the Performance of Perovskite Solar Cells

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