High open-circuit voltage in perovskite solar cells: The role of hole transport layer

Ompong, David; Singh, Jai

doi:10.1016/j.orgel.2018.09.006

Cited by 39 publications

(25 citation statements)

References 26 publications

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“…The conversion of solar energy to electrical and chemical energy has become the hot topic of research recently . Converting water into renewable hydrogen (H 2 ) fuel by photocatalytic water splitting, inspired by natural photosynthesis, has been considered as a promising avenue to settle the energy and environmental issues, attracting enthusiastic attention in recent decades .…”

Section: Figurementioning

confidence: 99%

“…The conversion of solar energy to electricala nd chemical energy has become the hot topic of research recently. [1][2][3][4][5][6][7][8][9][10] Converting water into renewable hydrogen (H 2 )f uelb yp hotocatalytic water splitting, inspiredb yn atural photosynthesis, has been considered as ap romising avenue to settle the energy and environmental issues, attracting enthusiastic attention in recent decades. [11][12][13][14][15] However,asacrificial agent (e.g.,m ethanol and ethanol) needs to be added to improvet he efficiency of solar-to-H 2 conversion in most reactions ystems.…”

mentioning

confidence: 99%

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Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Chao

Zhang

et al. 2018

Chemistry A European J

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Converting renewable biomass and their derivatives into chemicals and fuels has received much attention to reduce the dependence on fossil resources. Photocatalytic ethanol dehydrogenation–acetalization to prepare value‐added 1,1‐diethoxyethane and H2 was achieved over non‐precious metal CdS/Ni‐MoS2 catalyst under visible light. The system displays an excellent production rate and high selectivity of 1,1‐diethoxyethane, 52.1 mmol g−1 h−1 and 99.2 %, respectively. In‐situ electron spin resonance, photoluminescence spectroscopy and transient photocurrent responses were conducted to investigate the mechanism. This study provides a promising strategy for a green application of bioethanol.

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Section: Figurementioning

confidence: 99%

mentioning

confidence: 99%

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Chao

Zhang

et al. 2018

Chemistry A European J

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“…The third term has small contribution compared to the others. Therefore, PDTT-T with lower HOMO present a bigger V OC than PDT-T. 50 It is encouraging that both polymers can realize the FF close to 78%, which presents bright application prospect of the IDT/ IDTT−BDD polymers as high-efficiency HTMs of PVSCs.…”

Section: ■ Results and Discussionmentioning

confidence: 89%

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Wang

Zhuang

You

et al. 2020

ACS Appl. Energy Mater.

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Hole-transporting layer (HTL) plays a key role in most high-efficiency perovskite solar cells (PVSCs). Especially in the n-i-p conventional PVSCs, HTL promotes device performances through multiple ways, including hole injection and transport, interface optimization, inhibition of charges recombination, and protection of the perovskite active layer from oxygen, water, and metal electrode. Although spirobased small-molecular hole-transporting materials (HTMs) brought PCE records of PVSCs one by one, the poor film quality and requirement of additives brought some negative effects on the long-term stability of the devices. Therefore, dopant-free, compact polymeric HTLs attract intensive attention as potential alternatives to doped spiro-based ones. Among polymeric HTMs, electron donor (D)−acceptor (A)-type polymers become promising HTMs owing to the superior hole-transporting properties. In this work, two D−A polymers containing fused rings perform as dopant-free HTMs. The fused-ring ladder-type units can facilitate carrier transport, electron donation, and π−π stacking interactions. Polymers PDT-T and PDTT-T employ the same A unit of BDD and π-bridge of thiophene and different D units of IDT and IDTT. Both polymers exhibit favorable properties as HTMs including high hole mobility, well-matched energy levels, and excellent film-formation ability. Along with a peak PCE of 19.02%, the superior device stabilities of the PVSCs employing dopant-free PDT-T and PDTT-T over the reference devices confirm the significance of precise molecular design on fused-ring polymeric HTMs for the long-life PVSCs.

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“…As illustrated in previous reports, the p-type perovskite contacts p-type HTL, lending to an increased V oc for PSCs. [161,162] Comparing to the PEAI 2D passivated film and pure CF 3 PEAI film, in which the VBM is mismatched with the 3D perovskite or HTL, and thus forms a potential barrier to block the transfer of holes, the CF 3 PEAI 2D passivated films possess a compatible VBM of (−5.24 eV), which can help carrier extraction at the interface. Thus, the CF 3 PEAI 2D passivated films showed the most appropriate energy alignment with the HTL, which dramatically improved the photovoltaic performance of the PSCs.…”

Section: Energy Level Alignmentmentioning

confidence: 99%

Surface Passivation Using 2D Perovskites toward Efficient and Stable Perovskite Solar Cells

Wu¹,

Liang²,

et al. 2022

Advanced Materials

283

208

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first solid-state perovskite solar cell (PSC) was successfully prepared by introducing Sprio as a hole transport layer (HTL), tremendous efforts have been devoted to further promoting the photovoltaic performance, including surface passivation, bulk doping, processing engineering, and optimizing the structure of the device. [9][10][11][12][13][14][15][16][17][18][19][20][21] Consequently, the power conversion efficiency (PCE) of PSCs has dramatically increased from the initial 9% to an impressive 25.2% in several years. [22,23] To date, the coexistence of high efficiency and long-term stability has become a crucial requirement for successful PSC applications. 2D perovskites (consisting of pure 2D and quasi-2D perovskites) have emerged as a new family of photovoltaic materials that have been proven to resolve the problem of instability in perovskites. Owing to the insulating spacer layer, inherent outstanding long-term stability is obtained in 2D perovskites, including hydrophobicity, suppression of ion migration, and larger formation energy. [24][25][26][27][28] However, severe carrier recombination occurs due to the combined effect of quantum confinement and dielectric confinement, rooted in the natural multiple quantum wells structure (MQWs) (Figure 1), where the inorganic parts act as potential "wells" while the organic parts act as "walls", which shows a boost in the photovoltaic performance of 2D PSCs. [29][30][31] To realize the coexistence of high efficiency and ultrastability in PSCs, researchers began to construct 2D/3D heterostructures by surface passivation. [32][33][34][35][36][37][38][39][40] In fact, before the boosting of the 2D/3D stacking concept, many researchers have applied large ammonium cations (such as phenethylamine (PEA), butylamine (BA), and quaternary ammonium (QA)) as defect passivants to 3D perovskite solar cells. [41][42][43][44][45] During this period, the pure PEA-or BA-based 2D perovskites have been explored as light-absorbing materials for better stability. [25,46] In 2015, Yao et al. introduced in situ grown 2D perovskite (PEI) 2 PbI 4 (PEI: polymeric ammonium) on an MAPbI 3 film, leading to more stable and efficient PSCs. [47] In 2016, discussions and analyses of the surface passivation effect began to emerge, which involved exploring a series of 2D perovskite molecules (such as aniline, benzylamine, and PEA). [42,45,48] The concept of 2D/3D stacking really stood out in 2018 by unveiling the chemical reaction mechanism for heterojunction formation and the mechanism for enhancing stability. For example, Huang 3D perovskite solar cells (PSCs) have shown great promise for use in next-generation photovoltaic devices. However, some challenges need to be addressed before their commercial production, such as enormous defects formed on the surface, which result in severe SRH recombination, and inadequate material interplay between the composition, leading to thermal-, moisture-, and light-induced degradation. 2D perovskites, in which the organic layer functions as a protective barrier ...

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High open-circuit voltage in perovskite solar cells: The role of hole transport layer

Cited by 39 publications

References 26 publications

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Surface Passivation Using 2D Perovskites toward Efficient and Stable Perovskite Solar Cells

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