Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films

Cho, Namchul; Li, Feng; Türedi, Bekir; Sinatra, Lutfan; Sarmah, Smritakshi P.; Parida, Manas R.; Saidaminov, Makhsud I.; Murali, Banavoth; Burlakov, V. M.; Goriely, Alain; Mohammed, Omar F.; Wu, Tom; Bakr, Osman M.

doi:10.1038/ncomms13407

Cited by 199 publications

(208 citation statements)

References 55 publications

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“…Consequently, XRD measurements for the freezing cold-bathed wet film revealed no perovskite peaks; only the PbI 2 ·NMP adduct complex was observed ( Figure S5a, Supporting Information). [37] For more sophisticated control of the nucleation kinetics, we tuned the composition of the NMP:DMF solvent mixture for dissolving the precursor. The extremely slow crystallization kinetics appeared to modify the preferred orientation into the (112) and (224) planes, which is consistent with the results for perovskite films fabricated without antisolvent treatment.…”

Section: Resultsmentioning

confidence: 99%

Cold Antisolvent Bathing Derived Highly Efficient Large‐Area Perovskite Solar Cells

Jang

Kwon

et al. 2019

Advanced Energy Materials

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Scaling large-area solar cells is in high demand for the commercialization of perovskite solar cells (PSCs) with a high power-conversion efficiency (PCE).However, few roll-to-roll-compatible deposition methods for the formation of highly oriented uniform perovskite films are reported. Herein, a facile cold antisolvent bathing approach compatible with large-area fabrication is introduced. The wet precursor films are submerged in a cold antisolvent bath at 0 °C, and the retarded nucleation and growth kinetics allow highly oriented perovskite to be grown along the [110] and [220] directions, perpendicular to the substrate. The high degree of the preferred crystal orientation benefits the effective charge extraction and reduces the amount of inter-and intra-grain defects inside the perovskite films, improving the PCE from 16.48% (ambientbathed solar cell) to 18.50% (cold-bathed counterpart). The cold antisolvent bathing method is employed for the fabrication of large-area (8 × 10 cm 2 ) PSCs with uniform photovoltaic device parameters, thereby verifying the scale-up capability of the method.

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Section: Resultsmentioning

confidence: 99%

Cold Antisolvent Bathing Derived Highly Efficient Large‐Area Perovskite Solar Cells

Jang

Kwon

et al. 2019

Advanced Energy Materials

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“…[44] Figure S4 (Supporting Information) shows the current-voltage (I-V) responses of devices with ITO/perovskite/Au and ITO/JTCA/perovskite/ Au structures. [44] Figure S4 (Supporting Information) shows the current-voltage (I-V) responses of devices with ITO/perovskite/Au and ITO/JTCA/perovskite/ Au structures.…”

Section: Resultsmentioning

confidence: 99%

High‐Efficiency Low‐Temperature ZnO Based Perovskite Solar Cells Based on Highly Polar, Nonwetting Self‐Assembled Molecular Layers

Azmi

Hadmojo

Sinaga

et al. 2017

Advanced Energy Materials

158

164

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electron-accepting TiO 2 scaffolds require a high-temperature annealing process (≈500 °C), which limits their use with flexible substrates. Planar heterojunctionstructured PSCs have also been widely investigated because they enable adoption of low-temperature electron accepting layers (EALs). Zinc oxide, ZnO, is a strong EAL candidate because it offers good electrical properties even when prepared at low temperatures. [12][13][14][15][16] However, ZnO is used less often than mesoporous TiO 2 because it has several drawbacks. The surface properties of the ZnO layers are not favorable for growth of uniform perovskite layers with large crystal grains. This affects device performance significantly. [2,3,[7][8][9][10]17] Thus, efforts have been undertaken to improve perovskite layer quality by enhancing ZnO surface hydrophobicity. [18][19][20][21] Another shortcoming is the reverse reaction from perovskite to PbI 2 that can occur at ZnO/perovskite interfaces during perovskite layer formation. [14,[22][23][24] Two-step sequential deposition method has been employed to fabricate perovskite active layers on ZnO-EALs. This results in more reproducible synthesis of continuous, pinholefree perovskite layers than conventional single deposition methods. [15,21,[25][26][27][28][29] The perovskite layers in these reports were formed in two steps: (i) PbI 2 layer formation and (ii) perovskite layer formation, which occurred when the PbI 2 layer was immersed into an alkyl-ammonium iodide solution and annealed (80-100 °C). The sequential deposition method partially alleviated the burden of the reverse reaction that occurs at ZnO/perovskite interfaces, while helping to achieve a PCE of ≈16%. [15,30] Thus, the development of these strategies may offer a chance to further enhance low-temperature ZnO based PSC performance.Herein, we present high-efficiency, low-temperature PSCs using a strategy that combines self-assembled monolayer (SAM) modification of ZnO-EALs with sequential preparation of perovskite active layers. SAMs of the newly synthesized, highly polar molecules were constructed on ZnO-EALs and the perovskite layers were formed via sequential deposition. The SAMs acted as ZnO wetting control layers and as electric dipole layers. [1,13,19,20,[31][32][33] Modifying our SAMs enhanced the hydrophobicity of ZnO, which improved perovskite formation quality. Simultaneously, the electric dipole effect induced via Herein, this study reports high-efficiency, low-temperature ZnO based planar perovskite solar cells (PSCs) with state-of-the-art performance. They are achieved via a strategy that combines dual-functional self-assembled monolayer (SAM) modification of ZnO electron accepting layers (EALs) with sequential deposition of perovskite active layers. The SAMs, constructed from newly synthesized molecules with high dipole moments, act both as excellent surface wetting control layers and as electric dipole layers for ZnO-EALs. The insertion of SAMs improves the quality of PbI 2 layers and final perovskite layers during sequential dep...

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“…Recently, Cui and co-workers demonstrated linear-dichroic photodetectors based on black phosphorus with intrinsic optical anisotropy. [41] Compared to prior reports, [13,18,[39][40][41] the asymmetric-wettability assembly system exhibits versatility by controlling the position, alignment, and crystallographic orientation of perovskite structures. Additionally, considerable attention has been focused on fabricating perovskite 1D structures [13,18,39,40] and controlling the crystallographic orientation.…”

Section: Doi: 101002/adma201605993mentioning

confidence: 97%

Crystallographically Aligned Perovskite Structures for High‐Performance Polarization‐Sensitive Photodetectors

et al. 2017

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Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films

Cited by 199 publications

References 55 publications

Cold Antisolvent Bathing Derived Highly Efficient Large‐Area Perovskite Solar Cells

Cold Antisolvent Bathing Derived Highly Efficient Large‐Area Perovskite Solar Cells

High‐Efficiency Low‐Temperature ZnO Based Perovskite Solar Cells Based on Highly Polar, Nonwetting Self‐Assembled Molecular Layers

Crystallographically Aligned Perovskite Structures for High‐Performance Polarization‐Sensitive Photodetectors

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