Stability Challenges for Perovskite Solar Cells

Fu, Rui; Zhou, Wenke; Li, Qi; Zhao, Yao; Yu, Dapeng; Zhao, Qing

doi:10.1002/cnma.201800503

Cited by 42 publications

(30 citation statements)

References 105 publications

(198 reference statements)

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“…There are both intrinsic and extrinsic factors affecting the stability of perovskites, for example, the exposure to ultraviolet (UV) light, sensitivity to moisture and oxygen, thermal instability, ion migration, or chemical instability. [6][7][8][9] Stability improvements have been achieved through compositional modification of the perovskite materials, structural modifications, and interfacial engineering of the perovskite layers.…”

Section: Introductionmentioning

confidence: 99%

Impedance Spectroscopy of Perovskite Solar Cells: Studying the Dynamics of Charge Carriers Before and After Continuous Operation

Hailegnaw

Sariciftci

Scharber

2020

Physica Status Solidi (a)

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The issue of long‐term stability is one of the main obstacles challenging the progress of perovskite solar cells (PSCs). To alleviate this issue, a thorough understanding of the degradation mechanisms of the device is required. Herein, electrochemical impedance measurements in combination with maximum power point (MPP) tracking are applied to characterize PSCs, aiming to gain an understanding of the charge carrier dynamics in the photoactive bulk and at the contact‐absorber‐interfaces under operation. Electrochemical impedance spectroscopy (EIS) results show that the device charge transport resistance and interface capacitance associated with charge accumulation at the interfaces are both increasing upon continuous operation. This suggests ion migration from the photoactive perovskite layer to the charge transport layer interfaces leaving defects in the bulk. This suggests that reduction of the device performance upon continuous operation is mainly related to the changes in the bulk of the photoactive perovskite film and ions migration.

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Section: Introductionmentioning

confidence: 99%

Impedance Spectroscopy of Perovskite Solar Cells: Studying the Dynamics of Charge Carriers Before and After Continuous Operation

Hailegnaw

Sariciftci

Scharber

2020

Physica Status Solidi (a)

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“…Nevertheless, excessive replacement of Pb 2+ by Ba 2+ may result in unstable perovskite structure and lead to inferior photovoltaic properties and poor morphology. To solve this problem, polymer additives, including poly(vinylidene fluoride‐co‐trifluoroethylene) [P(VDF‐TrFE)], polymethyl methacrylate (PMMA), and PEG, were added into the lead‐reduced mixed‐cation perovskite to modify the perovskite films.…”

Section: Introductionmentioning

confidence: 99%

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Chan

et al. 2020

Solar RRL

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The organic–inorganic halide perovskite solar cells (PSCs) are rapidly developed in just a few years due to its high power conversion efficiency. However, it still faces some critical issues, one of which is the presence of toxic lead (Pb2+). Recent researches show that barium (Ba2+) can partially replace the Pb2+ in perovskite structure and achieve a promising device performance because of its adequate ionic radius. However, the optimal replacement amount of Ba2+ in perovskite is still limited. Herein, the methylammonium (MA)/formamidinium (FA) mixed‐cation perovskite is used as the active layer in PSCs and Pb2+ is partially substituted with Ba2+. Compared with the pure MA system, the best device efficiency can be achieved using higher Ba2+ replacement ratio. In addition, while introducing the appropriate polymer additive, the replacement ratio can be further increased without compromise of device efficiency. Using polyethylene glycol as polymer additive, 10.0 mol% Ba‐doped MA/FA mixed‐cation PSC with an efficiency of 16.1% can be realized. It is believed that this report provides an effective strategy to fabricate high‐performance lead‐reduced PSCs.

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“…Thus, controlling the orientation by poling the orientation or by interfacial engineering, the moisture stability could be enhanced. [77,78] One of the most recent encapsulation technique reported is based in ultrathin plasma polymers. This route has proved to be very successful with the use of cations larger than MA + like HOOC(CH 2 ) 4 NH 3 I (AVAI), containing four methylene hydrophobic carbons, or phenethylammonium iodide (PEAI).…”

Section: Hydrophobic Strategies To Achieve Long-term Pscsmentioning

confidence: 99%

“…[76] In addition the permeation of water vapour transmission rate (WVTR) and oxygen transmission rate (OTR) needs to be two or three orders of magnitude lower than the bare substrate, to achieve a final suitable encapsulation. [77,78] One of the most recent encapsulation technique reported is based in ultrathin plasma polymers. Anta and co-workers describe a room temperature deposition of a polymer by the remote plasma vacuum deposition of adamantine (ADA; C 10 H 16 ) powder, showing an impressive stability even immersed under water.…”

Section: Hydrophobic Strategies To Achieve Long-term Pscsmentioning

confidence: 99%

Crystalline Clear or Not: Beneficial and Harmful Effects of Water in Perovskite Solar Cells

2019

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Clarification of how water affects the photovoltaic performance of perovskite solar cells is one of the major challenges to successfully develop a large-scale low-cost fabrication process. Many authors have reported beneficial effects of moisture during the fabrication of perovskite solar cells (PSCs), such as enhanced crystallinity, photoluminescence and photovoltage. However, the highest power conversion efficiency reported until this date was obtained under completely dry atmosphere conditions, avoiding the presence of water during perovskite formulation and preserving the damage caused by moisture exposure with encapsulation techniques. This apparent contradiction makes patent the necessity of an extensive clarification to establish the conditions in which water represents a beneficial or harmful factor in the development of high efficiency and stable perovskite devices. In this review, we summarized the effects of water, both as an additive into the perovskite formulation as an additive and as moisture exposure during fabrication. We discuss in depth the structural and chemical effects, analysing also the photovoltaic consequences during operation conditions. As a final input, we remark a useful method to perform high efficiency PSCs under different lab ambient conditions and highlight the latest advances in hydrophobic devices and encapsulation techniques.

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Stability Challenges for Perovskite Solar Cells

Cited by 42 publications

References 105 publications

Impedance Spectroscopy of Perovskite Solar Cells: Studying the Dynamics of Charge Carriers Before and After Continuous Operation

Impedance Spectroscopy of Perovskite Solar Cells: Studying the Dynamics of Charge Carriers Before and After Continuous Operation

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Crystalline Clear or Not: Beneficial and Harmful Effects of Water in Perovskite Solar Cells

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