Photodecomposition and thermal decomposition in methylammonium halide lead perovskites and inferred design principles to increase photovoltaic device stability

Juárez-Pérez, Emilio J.; Ono, Luis K.; Maeda, Maki; Jiang, Yan; Hawash, Zafer; Qi, Yabing

doi:10.1039/c8ta03501f

Cited by 518 publications

(578 citation statements)

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“…The generation of defects may take place not only during the perovskite synthesis processes, but also during the perovskite solar cell operation. For example, methylammonium lead iodide (MAPbI 3 ) undergoes photodecomposition and thermal degradation during solar cell operation . Two reaction pathways were identified for these degradation processes (Figure c).…”

Section: Defects In Metal Halide Perovskitesmentioning

confidence: 99%

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

2020

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In several photovoltaic (PV) technologies, the presence of electronic defects within the semiconductor band gap limit the efficiency, reproducibility, as well as lifetime. Metal halide perovskites (MHPs) have drawn great attention because of their excellent photovoltaic properties that can be achieved even without a very strict film‐growth control processing. Much has been done theoretically in describing the different point defects in MHPs. Herein, we discuss the experimental challenges in thoroughly characterizing the defects in MHPs such as, experimental assignment of the type of defects, defects densities, and the energy positions within the band gap induced by these defects. The second topic of this Review is passivation strategies. Based on a literature survey, the different types of defects that are important to consider and need to be minimized are examined. A complete fundamental understanding of defect nature in MHPs is needed to further improve their optoelectronic functionalities.

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Section: Defects In Metal Halide Perovskitesmentioning

confidence: 99%

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

2020

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confidence: 99%

Progress of Lead‐Free Halide Double Perovskites

Igbari

Wang

Liao

2019

Advanced Energy Materials

397

305

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Although impressive performance has been obtained, PSCs are still far from commercial or real-life availability due to serious issues such as toxicity [15,16] and poor stability to heat, [17] oxygen, [18] moisture, [19,20] electric field, [21] and light. [18,22] The toxic nature of hybrid organic-inorganic lead halide perovskites has been traced to the presence of Pb in its chemical composition. [15,16,[23][24][25] Pb 2+ readily dissolves in water (e.g., rain water) to form a toxic solution capable of causing serious environmental pollution, harmful to human beings and the ecosystem. Besides their sensitivity to moisture, oxygen, light, electric field, or thermal stress, an existing self-degradation pathway [26,27] is also a big issue in hybrid organic-inorganic lead halide perovskites. Mixed-halide and mixed-cation perovskites have been investigated to address these issues. [28][29][30][31][32] The group IV elements, tin (Sn) [23,[33][34][35] and germanium (Ge), [34,36] have been employed as the replacements for Pb. However, the device performance through this approach has fallen short of the Pb-based ones. For example, the PCEs reported for Sn-based perovskite solar cells are usually less than 10%. [23,[33][34][35][37][38][39][40] In addition, the easy oxidation of Sn and Ge from the +2 state to the +4 state due to their high energy 5s and 4s orbitals makes them less promising for application in stable and long-term PSCs. [41] High throughput calculations also demonstrate that these substitutions are likely to compromise the ideal optoelectronic properties of MAPbI 3 . [42,43] Furthermore, low dimensional (e.g., 2D, 1D, and 0D) perovskites have also been used to address the stability issues in PSCs. [44][45][46][47][48] Recently, a stabilized PCE of 21.7% resulting from a 2D/3D bilayer PSC was reported. [49] However, the highest certified PCE in a 2D-only planar PSC is 15.3%, [50] which is far below that of their 3D perovskite-based counterparts. It thus stimulates the interest to develop new classes of materials which can solve the issues of toxicity and stability while still maintaining the fascinating properties of lead-based perovskite materials.Recent theoretical calculations demonstrate that a halide double perovskite structure, A 2 B′B″X 6 , which could be formed through a replacement of two toxic Pb 2+ in the crystal lattice with a pair of nontoxic heterovalent (i.e., monovalent and trivalent) metal cations, is a promising alternative to realize high-performance, lead-free, and stable PSCs. [51,52] Although, spectroscopic limited maximum efficiency (SLME) calculations revealed an efficiency limit less than 8% for the most prominent member www.advancedsciencenews.com double perovskites with a vacancy ordered structure. [88] In particular, the unit cell axis of Cs 2 AgBiBr 6 is given to be ≈11.25 Å, [25] which is two times larger than that of MAPbBr 3 (≈5.92 Å). [89] Both Ag + and Bi 3+ occupy the B-site of the crystal lattice with slightly varied metal-halide bond lengths. The dissimilar bond lengths st...

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“…This work highlights the importance of the dynamical processes taking place after an I‐related defect is generated in MAPbI 3 . Qi and co‐workers proposed that the generation of I 2 would lead further to subsequent degradation in a cascade effect highlighting the importance of iodine management 79a,96. Recently, it was shown that I 2 generation is mediated by I i + /I i − defect pair (Figure c) .…”

Section: Defects and Interface Engineeringmentioning

confidence: 99%

Progress of Surface Science Studies on ABX₃‐Based Metal Halide Perovskite Solar Cells

Qiu

Ono

et al. 2019

Advanced Energy Materials

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ABX3 type metal halide perovskite solar cells (PSCs) have shown efficiencies over 25%, rocketing toward their theoretical limit. To gain the full potential of PSCs relies on the understanding of the device working mechanisms and recombination, the material quality, and the match of energy levels in the device stacks. In this review, the importance of designing PSCs from the viewpoint of surface/interface science studies is presented. For this purpose, recent case studies are discussed to demonstrate how probing of local heterogeneities (e.g., grains, grain boundaries, atomic structure, etc.) in perovskites by surface science techniques can help correlate material properties and PSC device performance. At the solar cell device level with active areas larger than millimeter scale, the ensemble average measurement techniques can characterize the overall average properties of perovskite films as well as their adjacent layers and provide clues to understand better the solar cell parameters. How generation and healing of electronic defects in perovskite films limit the device efficiency, reproducibility, and stability, and induce the time‐dependent transient behavior in the current‐voltage curves are also the central focus of this review. On the basis of these studies, strategies to further improve efficiency and stability, as well as reducing hysteresis are presented.

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Photodecomposition and thermal decomposition in methylammonium halide lead perovskites and inferred design principles to increase photovoltaic device stability

Abstract: Strategies of how to mitigate photodegradation and thermal degradation processes are proposed in this work in order to further improve operational stability in hybrid perovskite solar cells.

Cited by 518 publications

References 29 publications

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

Progress of Lead‐Free Halide Double Perovskites

Progress of Surface Science Studies on ABX₃‐Based Metal Halide Perovskite Solar Cells

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Photodecomposition and thermal decomposition in methylammonium halide lead perovskites and inferred design principles to increase photovoltaic device stability

Abstract: Strategies of how to mitigate photodegradation and thermal degradation processes are proposed in this work in order to further improve operational stability in hybrid perovskite solar cells.

Cited by 518 publications

References 29 publications

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells

Progress of Lead‐Free Halide Double Perovskites

Progress of Surface Science Studies on ABX3‐Based Metal Halide Perovskite Solar Cells

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Product

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Progress of Surface Science Studies on ABX₃‐Based Metal Halide Perovskite Solar Cells