Modulating preferred crystal orientation for efficient and stable perovskite solar cells—From progress to perspectives

Fang, Zhimin; Yan, Nan; Liu, Shengzhong

doi:10.1002/inf2.12369

Cited by 39 publications

(18 citation statements)

References 192 publications

(433 reference statements)

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“…As reported in several publications, 22,38,39 solution-based PVKs show optoelectronic properties dependent on crystal orientation. Hereby, we investigate the influence of orientation growth on optoelectronic properties based on thermally evaporated PVKs.…”

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confidence: 65%

“…Recently, Li et al prepared minimodules based on thermally evaporated PVKs, with a champion PCE above 18% with an active area of 22 cm 2 . However, manipulating the preferential orientation of the PVK crystal growth in layers prepared by thermal evaporation has hardly been addressed. , To date, only two papers have been reported on the control of the preferential growth of thermally evaporated PVKs. Abzieher et al investigated the effects of substrate material on the orientation of methylammonium lead iodide (MAPbI 3 ) crystals and identified few organic hole transport materials as ideal candidates for the fabrication of efficient fully evaporated PSCs .…”

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confidence: 99%

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Vacuum Deposited Perovskites with a Controllable Crystal Orientation

Yan,

Stickel,

van den Hengel

et al. 2023

J. Phys. Chem. Lett.

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The preferential orientation of the perovskite (PVK) is typically accomplished by manipulation of the mixed cation/halide composition of the solution used for wet processing. However, for PVKs grown by thermal evaporation, this has been rarely addressed. It is unclear how variation in crystal orientation affects the optoelectronic properties of thermally evaporated films, including the charge carrier mobility, lifetime, and trap densities. In this study, we use different intermediate annealing temperatures T inter between two sequential evaporation cycles to control the Cs 0.15 FA 0.85 PbI 2.85 Br 0.15 orientation of the final PVK layer. XRD and 2D-XRD measurements reveal that when using no intermediate annealing primarily the (110) orientation is obtained, while when using T inter = 100 °C a nearly isotropic orientation is found. Most interestingly for T inter > 130 °C a highly oriented PVK (100) is formed. We found that although bulk electronic properties like photoconductivity are independent of the preferential orientation, surface related properties differ substantially. The highly oriented PVK (100) exhibits improved photoluminescence in terms of yield and lifetime. In addition, high spatial resolution mappings of the contact potential difference (CPD) as measured by KPFM for the highly oriented PVK show a more homogeneous surface potential distribution than those of the nonoriented PVK. These observations suggest that a highly oriented growth of thermally evaporated PVK is preferred to improve the charge extraction at the device level.

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confidence: 65%

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confidence: 99%

Vacuum Deposited Perovskites with a Controllable Crystal Orientation

Yan,

Stickel,

van den Hengel

et al. 2023

J. Phys. Chem. Lett.

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“…Additive engineering has been widely used to modulate crystallization and passivate defects via various chemical interactions to improve the efficiency and stability of PSCs [121][122][123][124]. For WBG perovskites, the heavy Cs or Br contents would dramatically accelerate the crystallization process, resulting in inferior crystallinity, rough surface and more trap states, which can significantly limit the V OC improvement and photostability of the devices [125]. Therefore, simultaneously optimizing the crystallization and passivating defects of WBG perovskite films via additive engineering is of great significance for high-performance PSCs.…”

Section: Additive Engineeringmentioning

confidence: 99%

Recent Advances in Wide-Bandgap Organic–Inorganic Halide Perovskite Solar Cells and Tandem Application

et al. 2023

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Perovskite-based tandem solar cells have attracted increasing interest because of its great potential to surpass the Shockley–Queisser limit set for single-junction solar cells. In the tandem architectures, the wide-bandgap (WBG) perovskites act as the front absorber to offer higher open-circuit voltage (VOC) for reduced thermalization losses. Taking advantage of tunable bandgap of the perovskite materials, the WBG perovskites can be easily obtained by substituting halide iodine with bromine, and substituting organic ions FA and MA with Cs. To date, the most concerned issues for the WBG perovskite solar cells (PSCs) are huge VOC deficit and severe photo-induced phase separation. Reducing VOC loss and improving photostability of the WBG PSCs are crucial for further efficiency breakthrough. Recently, scientists have made great efforts to overcome these key issues with tremendous progresses. In this review, we first summarize the recent progress of WBG perovskites from the aspects of compositions, additives, charge transport layers, interfaces and preparation methods. The key factors affecting efficiency and stability are then carefully discussed, which would provide decent guidance to develop highly efficient and stable WBG PSCs for tandem application.

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“…14 The crystallization process of the perovskite film made by the two-step method is primarily based on the formation of a perovskite capping layer and a dissolution-recrystallization process, making the morphology of PbI 2 of great influence on the crystal quality of perovskite films. 15,16 Generally, it is difficult to completely convert the dense PbI 2 layer into perovskite, which results in an excessive residual PbI 2 and pin-holes formed in the perovskite layer, that in turn cause nonradiative recombination and an acceleration of the solar cells degradation. 17,18 Therefore, improving the conversion of PbI 2 to a perovskite is highly desired and has been explored via several different strategies.…”

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NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

Du,

Wang,

et al. 2023

InfoMat

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Driven by their many unique features, perovskite solar cells (PSCs) have become one of the most promising candidates in the photovoltaic field. Twostep preparation of perovskite film is advantageous for its higher stability and reproducibility compared to the one-step method, which is more suitable for practical application. However, the incomplete conversion of the dense lead iodide (PbI 2 ) layer during the sequential spin-coating of formamidinium/ methylammonium (FA + /MA + ) organic amine salts severely affect the performance of PSCs. Herein, sodium bicarbonate (NaHCO 3 ) is used to induce the formation of porous PbI 2 , which facilitates the penetration of the FA + /MA + ions and the formation of a perovskite film with high crystallinity and large grain microstructure. Meanwhile, the introduction of Na + not only improves the energetic alignment of the PSC, but also increases the conductivity via pdoping. As a result, the optimized NaHCO 3 -modified PSC achieves a champion power conversion efficiency of 24.0% with suppressed hysteresis. Moreover, the significant reduction in defect density and ion migration as well as a mild alkaline environment enhance the stability of device. The unencapsulated NaHCO 3 -modified PSCs maintain over 90% of their original efficiency upon storage in ambient air (30%-40% relative humidity) for 2160 h. We have demonstrated an ingenious strategy for controlling the quality of perovskite and improving the performance of device by low-temperature foaming of simple inorganic molecules of NaHCO 3 .lead iodide (PbI 2 ), perovskite solar cell, porous materials, sodium bicarbonate (NaHCO 3 ), two-step deposition Yitian Du and Ying Wang contributed equally to this study.

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Modulating preferred crystal orientation for efficient and stable perovskite solar cells—From progress to perspectives

Cited by 39 publications

References 192 publications

Vacuum Deposited Perovskites with a Controllable Crystal Orientation

Vacuum Deposited Perovskites with a Controllable Crystal Orientation

Recent Advances in Wide-Bandgap Organic–Inorganic Halide Perovskite Solar Cells and Tandem Application

NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

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Modulating preferred crystal orientation for efficient and stable perovskite solar cells—From progress to perspectives

Cited by 39 publications

References 192 publications

Vacuum Deposited Perovskites with a Controllable Crystal Orientation

Vacuum Deposited Perovskites with a Controllable Crystal Orientation

Recent Advances in Wide-Bandgap Organic–Inorganic Halide Perovskite Solar Cells and Tandem Application

NaHCO3‐induced porous PbI2 enabling efficient and stable perovskite solar cells

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Product

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NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells