Large Planar π-Conjugated Porphyrin for Interfacial Engineering in p-i-n Perovskite Solar Cells

Li, Bobo; Zheng, Chaoyue; Liu, Huan; Zhu, Jie; Zhang, Hongmei; Gao, Deqing; Huang, Wei

doi:10.1021/acsami.6b10342

Cited by 74 publications

(56 citation statements)

References 29 publications

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“…. Sim ilarly, zinc(II) 5,10,15,20-tetrakis[5-(p-acetylthiopentyloxy) phenyl]porphyrin [130] was employed as a buffer layer between PEDOT: PSS and perovskite films in inverted planar PSCs to modify the interfacial properties. A PCE~14.05% is reported for PSCs employing PEDOT: PSS/porphyrin compared to~11.35% for pristine PEDOT: PSS.…”

Section: Porphyrinmentioning

confidence: 99%

Advances in hole transport materials engineering for stable and efficient perovskite solar cells

et al. 2017

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This article reviews the various hole transporting materials (HTMs) used in perovskite solar cells (PSCs) in achieving high photo conversion efficiency (PCE) and operational stability. The PSCs are the latest development in solution processable solar cells offering PCE (~22%) on a par with that of practically deployed silicon and thin film solar cells. HTMs and electron transporting materials (ETMs) are important constituents in PSCs as they selectively transport charges within the device, influence photovoltaic parameters, determine device stability and also influence its cost. This article critically approaches role of structure, electrochemistry, and physical properties of varied of choice of HTMs categorized diversely as small and long polymers, organometallic, and inorganic on the photovoltaic parameters of PSCs conceived in various device configurations. Achievements in tailoring the properties of HTMs to best fit for PSCs are detailed; a well designed HTM suppresses carrier recombination by facilitating the passage of holes but blocking electrons at the HTM/perovskite interface. Moreover, in many PSCs the HTM acts as the first line of defense to external degrading factors such as humidity, oxygen and photon dose, the extent of which depends on its hydrophobicity, permeability, and density.

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Section: Porphyrinmentioning

confidence: 99%

Advances in hole transport materials engineering for stable and efficient perovskite solar cells

et al. 2017

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“…The BHJ composite is usually deposited from apolar organic solvents; it is therefore advantageous that the IL material is soluble in water or alcohols. Small molecule analogues of chlorophylls, porphyrins and their derivatives have been intensively investigated as IL materials due to their large π‐conjugated planar structures and easy chemical modifications of the peripheries to improve the intramolecular charge transport and electron transfer . For example, Zhang et al developed a CIL based on a water‐soluble conjugated porphyrin, FNEZnP‐OE , in which two amino‐functionalized fluorenes are linked to a porphyrin core by ethynyl linkages (Scheme 2) .…”

Section: Classes Of Materials Used In Interfacial Layersmentioning

confidence: 99%

Molecular design of interfacial layers based on conjugated polythiophenes for polymer and hybrid solar cells

Houston

Richeter

Clément

et al. 2017

Polymer International

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In the past two decades, bulk heterojunction organic photovoltaic (OPV) devices have emerged as attractive candidates for solar energy conversion due to their lightweight design and potential for low‐cost, high‐throughput, solution‐phase processability. Interfacial engineering is a proven efficient approach to achieve OPV devices with high power conversion efficiencies. This mini‐review provides an overview of the key structural considerations necessary when undertaking the molecular design of conjugated polyelectrolytes, for application as interfacial layers (ILs). The different roles of ILs are outlined, together with the advantages and disadvantages of competing classes of IL materials. Particular emphasis is placed on the design and synthesis of water‐soluble polythiophene‐based IL materials and the influence of their structural characteristics on their performance as a promising class of IL material. Finally, the challenges and opportunities for polythiophenes as IL materials for OPV devices and other solution‐processed solar cell technologies (e.g. perovskite solar cells) are discussed. © 2017 Society of Chemical Industry

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“…On the other hand, the HTL/perovskite interface has been modified by similar approaches. Incorporation of p-conjugated porphyrin layer [25] and polar molecule silane [26] to the interface enhances V oc by mitigation of trap states. Thiols- [27] and polymer- [28] modified perovskite surfaces have also increases device PCE and stability.A dditionally,p erovskite/HTL interface was improved by compositional change of mixed perovskite to enhance voltage and PCE.…”

Section: Introductionmentioning

confidence: 99%

Poly(4‐Vinylpyridine)‐Based Interfacial Passivation to Enhance Voltage and Moisture Stability of Lead Halide Perovskite Solar Cells

et al. 2017

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It is well known that the surface trap states and electronic disorders in the solution-processed CH NH PbI perovskite film affect the solar cell performance significantly and moisture sensitivity of photoactive perovskite material limits its practical applications. Herein, we show the surface modification of a perovskite film with a solution-processable hydrophobic polymer (poly(4-vinylpyridine), PVP), which passivates the undercoordinated lead (Pb) atoms (on the surface of perovskite) by its pyridine Lewis base side chains and thereby eliminates surface-trap states and non-radiative recombination. Moreover, it acts as an electron barrier between the perovskite and hole-transport layer (HTL) to reduce interfacial charge recombination, which led to improvement in open-circuit voltage (V ) by 120 to 160 mV whereas the standard cell fabricated in same conditions showed V as low as 0.9 V owing to dominating interfacial recombination processes. Consequently, the power conversion efficiency (PCE) increased by 3 to 5 % in the polymer-modified devices (PCE=15 %) with V more than 1.05 V and hysteresis-less J-V curves. Advantageously, hydrophobicity of the polymer chain was found to protect the perovskite surface from moisture and improved stability of the non-encapsulated cells, which retained their device performance up to 30 days of exposure to open atmosphere (50 % humidity).

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Large Planar π-Conjugated Porphyrin for Interfacial Engineering in p-i-n Perovskite Solar Cells

Cited by 74 publications

References 29 publications

Advances in hole transport materials engineering for stable and efficient perovskite solar cells

Advances in hole transport materials engineering for stable and efficient perovskite solar cells

Molecular design of interfacial layers based on conjugated polythiophenes for polymer and hybrid solar cells

Poly(4‐Vinylpyridine)‐Based Interfacial Passivation to Enhance Voltage and Moisture Stability of Lead Halide Perovskite Solar Cells

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