Toward Highly Thermal Stable Perovskite Solar Cells by Rational Design of Interfacial Layer

Yang, Weitao; Zhong, Danming; Shi, Minmin; Qu, Shaoxing; Chen, Hongzheng

doi:10.1016/j.isci.2019.11.007

Cited by 44 publications

(48 citation statements)

References 41 publications

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“…This absorption trend, as a function of the aging time, for the perovskite peak, is comparable with the PCE trend at the same time interval, as clearly summarized in Figure 5C. These data confirm that the TE_PSCs stability is primarily driven by the intrinsic film stability due to the low-temperature co-evaporation perovskite growth process leading to an almost stress-free perovskite [61,70,71] and subsequently enhanced by the presence of Spiro-OMeTAD which efficiently acts as a capping layer.…”

Section: (4 Of 9)supporting

confidence: 81%

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: 81%

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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“…where Δ t is the thermal stress duration,

S_{{P b I}_{2}}

and

S_{normalp normale normalr normalo normalv normals normalk normali normalt normale}

are the peak areas of PbI 2 and the main Bragg peaks of (PDA)(FA) 3 Pb 4 I 13 and (PDA)(MA) 3 Pb 4 I 13 , b is the calibration factor determined as the ratio of the PbI 2 peak area of the completely decomposed film to the main perovskite peak area in the fresh sample [30] . The rate k can also be expressed by the Arrhenius equation

true k = A normale normalx normalp ((), \frac{- E_{normala}}{R T})

…”

Section: Resultsmentioning

confidence: 99%

Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Cheng

Liu

et al. 2020

Angewandte Chemie

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Currently, most two‐dimensional (2D) metal halide perovskites are of the Ruddlesden–Popper type and contain the thermally unstable methylammonium (MA) molecules, which leads to inferior photovoltaic performance and mild stability. Here we report a new type of MA‐free formamidinium (FA) based low‐dimensional perovskites, featuring a general formula of (PDA)(FA)n−1PbnI3n+1 with propane‐1,3‐diammonium (PDA) as the organic spacer cation. The perovskite films with well‐oriented crystal grains are attained under the assistance of the FACl additive, where the role of Cl is investigated through the grazing‐incidence X‐ray diffraction technique. The photovoltaic device based on the optimized (PDA)(FA)3Pb4I13 film demonstrates a remarkable power conversion efficiency of 13.8 %, the highest record for the FA‐based 2D perovskite solar cells. In addition, compared to (PDA)(MA)3Pb4I13, the MA‐containing analogue and a renowned stable 2D perovskite, both the (PDA)(FA)3Pb4I13 films and their derived devices exhibit exceedingly higher thermal stability.

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“…However, engineering CsPbI 3 perovskite with organic cations to improve its intrinsic stability is limited to only a few organic cations such as formamidinium (FA) ( Hazarika et al., 2018 ) and methylammonium (MA) ( Wang and Chen, 2016 ). MA and FA cations are inherently unstable in thermal and UV conditions, leading to the degradation of perovskite and the poor lifetime of the photovoltaic devices ( Chen et al., 2020b ; Juarez-Perez et al., 2016 ; Yang et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Engineering bandgap of CsPbI3 over 1.7 eV with enhanced stability and transport properties

Libanori

Luo

2021

iScience

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Summary Potential multijunction application of CsPbI 3 perovskite with silicon solar cells to reach efficiencies beyond the Shockley-Queisser limit motivates tremendous efforts to improve its phase stability and further enlarge its band gap between 1.7 and 1.8 eV. Current strategies to increase band gap via conventional mixed halide engineering are accompanied by detrimental phase segregation under illumination. Here, ethylammonium (EA) in a relatively small fraction ( x < 0.15) is first investigated to fit into three-dimensional CsPbI 3 framework to form pure-phase hybrid perovskites with enlarged band gap over 1.7 eV. The increase of band gap is closely associated with the distortion of Pb-I octahedra and the variation of the average Pb-I-Pb angle. Meanwhile, the introduction of EA can retard the crystallization of perovskite and tune the perovskite structure with enhanced phase stability and transport properties.

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Toward Highly Thermal Stable Perovskite Solar Cells by Rational Design of Interfacial Layer

Cited by 44 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

Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Engineering bandgap of CsPbI3 over 1.7 eV with enhanced stability and transport properties

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Toward Highly Thermal Stable Perovskite Solar Cells by Rational Design of Interfacial Layer

Cited by 44 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

Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Engineering bandgap of CsPbI3 over 1.7 eV with enhanced stability and transport properties

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Product

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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