Improving the stability of MAPbI3 films by using a new synthesis route

Gordillo, G.; Torres, O. G.; Abella, M. C.; Peña, J.C.; Virguez, Ophyr

doi:10.1016/j.jmrt.2020.09.095

Cited by 13 publications

(9 citation statements)

References 41 publications

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“…The faster PCE degradation for SC_MAPbI 3 as compared to the pure film, Figure S11C, Supporting Information, is related to poorer perovskite robustness and pinholes formation under high-temperature aging. The superior thermal stability of coevaporated MAPbI 3 films is in line with the improved ambient stability in high humidity (≈80 RH) of vacuum processed MAPbI 3 films as compared to the solution-based film showed by Gordillo et al [72]…”

Section: (4 Of 9)supporting

confidence: 67%

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Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI₃ Solar Cells at 85 °C

Dewi

Wang

et al. 2021

Adv Funct Materials

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Thermal stability is a critical criterion for assessing the long-term stability of perovskite solar cells (PSCs). Here, it is shown that un-encapsulated co-evaporated MAPbI 3 (TE_MAPbI 3 ) PSCs demonstrate remarkable thermal stability even in an n-i-p structure that employs Spiro-OMeTAD as hole transport material (HTM). TE_MAPbI 3 PSCs maintain over ≈95% and ≈80% of their initial power conversion efficiency (PCE) after 1000 and 3600 h respectively under continuous thermal aging at 85 °C. TE_MAPbI 3 PSCs demonstrate remarkable structural robustness, absence of pinholes, or significant variation in grain sizes, and intact interfaces with the HTM, upon prolonged thermal aging. Here, the main factors driving TE_MAPbI 3 stability are assessed. It is demonstrated that the excellent TE_MAPbI 3 thermal stability is related to the perovskite growth process leading to a compact and almost strain-stress-free film. On the other hand, un-encapsulated PSCs with the same architecture, but incorporating solutionprocessed MAPbI 3 or Cs 0.05 (MA 0.17 FA 0.83 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 as active layers, show a complete PCE degradation after 500 h under the same thermal aging condition. These results highlight that the control of the perovskite growth process can substantially enhance the PSCs thermal stability, besides the chemical composition. The TE_MAPbI 3 impressive long-term thermal stability features the potential for field-operating conditions.

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Section: (4 Of 9)supporting

confidence: 67%

“…The superior thermal stability of co‐evaporated MAPbI 3 films is in line with the improved ambient stability in high humidity (≈80 RH) of vacuum processed MAPbI 3 films as compared to the solution‐based film showed by Gordillo et al. [ 72 ]…”

Section: Resultssupporting

confidence: 52%

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI₃ Solar Cells at 85 °C

Dewi

Wang

et al. 2021

Adv Funct Materials

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“…[4][5][6][7][8][9] However, these perovskite materials have a major drawback of poor ambient stability, which greatly hampers their utilization for photodetectors and other optoelectronics devices. [10,11] In order to tackle this stability issue, quasi-2D perovskites are newly proposed, where the bulky organic mole- (phenethylammonium, PEA), are inserted into the conventional 3D halide perovskite lattice (e.g., MAPbI 3 ) to severe as the spacer cation. [12][13][14] This kind of quasi-2D halide perovskites, also known as Ruddlesden-Popper perovskites (RPPs), can exhibit relatively high ambient stability over 3D perovskites because of their hydrophobic nature of the spacer molecules.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Flexible Self‐Powered Photodetectors Utilizing Spontaneous Electron and Hole Separation in Quasi‐2D Halide Perovskites

Lai

Meng

Zhu

et al. 2021

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Although there are recent advances in many areas of quasi‐2D halide perovskites, photodetectors based on these materials still cannot achieve satisfactory performance for practical applications where high responsivity, fast response, self‐powered nature, and excellent mechanical flexibility are urgently desired. Herein, utilizing one‐step spin‐coating method, self‐assemble quasi‐2D perovskite films with graded phase distribution in the order of increasing number of metal halide octahedral layers are successfully prepared. Gradient type‐II band alignments along the out‐of‐plane direction of perovskites with spontaneous separation of photo‐generated electrons and holes are obtained and then employed to construct self‐powered vertical‐structure photodetectors for the first time. Without any driving voltage, the device exhibits impressive performance with the responsivity up to 444 mA W−1 and ultrashort response time down to 52 µs. With a bias voltage of 1.5 V, the device responsivity becomes 3463 mA W−1 with the response speed as fast as 24 µs. Importantly, the device's mechanical flexibility is greatly enhanced since the photocurrent prefers flowing through the metal halide octahedral layers between the top and bottom contact electrodes in the vertical device structure, being more tolerant to film damage. These results evidently indicate the potential of graded quasi‐2D perovskite phases for next‐generation optoelectronic devices.

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“…The second unsolved issue lies within the ternary perovskite absorber layer itself, particularly the most studied and employed methyl ammonium lead iodide CH 3 NH 3 PbI 3 (MAPI) . Although perovskites exhibit exceptional optoelectronic properties that are crucial for solar applications, they suffer from high sensitivity to humidity, temperature, and light in ambient conditions that leads to degradation of the compound. − Research has been conducted to address these issues, e.g., by encapsulation, new synthesis routes, and tuning of the perovskite structure by including additives, but no ultimate solution has been found yet. − …”

Section: Introductionmentioning

confidence: 99%

Atomic Layer Deposition of CsI and CsPbI₃

et al. 2022

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Cesium iodide (CsI) is a well-established scintillator material that also serves as a precursor for all-inorganic halide perovskite solar absorbers, such as CsPbI 3 . However, the lack of conformal and scalable methods to deposit halide perovskite thin films remains a major challenge on their way to commercialization. In this work, we employ atomic layer deposition (ALD) as the key method due to its inherent scalability to large areas and complex-shaped surfaces. We demonstrate two new ALD processes for the deposition of CsI and CsPbI 3 thin films. The CsI process relies on cesium bis(trimethylsilyl) amide (Cs(btsa)) and tin(IV) iodide (SnI 4 ) as precursors and yields high-purity, uniform, and phase-pure thin films. This process works in a wide temperature range (140−350 °C) and exhibits a large growth per cycle value (GPC) of 3.3 Å (85% of a CsI monolayer). Furthermore, we convert CsI into CsPbI 3 perovskite by exposing a CsI film to our earlier PbI 2 ALD process. We demonstrate the deposition of phase-pure γor δ-CsPbI 3 perovskite thin films, depending on the applied deposition temperature and number of PbI 2 cycles. We believe that the ALD-based approach described in this work will offer a viable alternative for depositing perovskite thin films in applications that involve complex high aspect ratio structures or large substrate areas.

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Improving the stability of MAPbI3 films by using a new synthesis route

Cited by 13 publications

References 41 publications

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI₃ Solar Cells at 85 °C

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI₃ Solar Cells at 85 °C

High‐Performance Flexible Self‐Powered Photodetectors Utilizing Spontaneous Electron and Hole Separation in Quasi‐2D Halide Perovskites

Atomic Layer Deposition of CsI and CsPbI₃

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Improving the stability of MAPbI3 films by using a new synthesis route

Cited by 13 publications

References 41 publications

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI3 Solar Cells at 85 °C

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI3 Solar Cells at 85 °C

High‐Performance Flexible Self‐Powered Photodetectors Utilizing Spontaneous Electron and Hole Separation in Quasi‐2D Halide Perovskites

Atomic Layer Deposition of CsI and CsPbI3

Contact Info

Product

Resources

About

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI₃ Solar Cells at 85 °C

Excellent Intrinsic Long‐Term Thermal Stability of Co‐Evaporated MAPbI₃ Solar Cells at 85 °C

Atomic Layer Deposition of CsI and CsPbI₃