Chemical sintering reduced grain boundary defects for stable planar perovskite solar cells

Xi, Jun; Xi, Kai; Sadhanala, Aditya; Zhang, Kelvin H. L.; Li, Guangru; Dong, Hua; Lei, Ting; Yuan, Fang; Ran, Chenxin; Jiao, Bo; Coxon, Paul R.; Harris, Christopher; Hou, Xun; Kumar, R. Vasant; Wu, Zhaoxin

doi:10.1016/j.nanoen.2018.11.021

Cited by 68 publications

(52 citation statements)

References 50 publications

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“…Similar result was reported by Zhao et al in inverted PSCs as well . Similarly, guanidine thiocyanate (GuaSCN), ammonium thiocyanate (NH 4 SCN) have also been reported to coarsen the grains of perovskite films via Oswald ripening process . Luo et al applied guanidinium bromide (GuaBr) via spin‐coated on top of perovskite layer, which processed a solution‐processed secondary growth (SSG) to form a wider bandgap region .…”

Section: Modulating Morphologysupporting

confidence: 63%

A Review on Additives for Halide Perovskite Solar Cells

Liu

Guan

Sheng

et al. 2019

Advanced Energy Materials

285

240

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Additives are widely adopted for efficient, stable, and hysteresis‐free perovskite solar cells and play an important role in various breakthroughs of perovskite solar cells (PSCs). Herein the various additives adopted for PSCs are reviewed and their functioning mechanism and influence on device performance is described. The main roles of additives, modulating morphology of perovskite films, stabilizing phase of formamidinium (FA) and cesium (Cs)‐based perovskites, adjusting energy level alignment in PSCs, suppressing nonradiative recombination in perovskites, eliminating hysteresis, enhancing operational stability of PSCs, are summarized.

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Section: Modulating Morphologysupporting

confidence: 63%

A Review on Additives for Halide Perovskite Solar Cells

Liu

Guan

Sheng

et al. 2019

Advanced Energy Materials

285

240

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“…The research of a thin‐film photovoltaic device based on a hybrid organic–inorganic lead (Pb) halide perovskite material has been significantly progressed during the last decade, and the world record power conversion efficiency (PCE) has recently reached 24.2% . The promising performance of perovskite solar cells (PSCs) is already competitive with CdTe and polycrystalline silicon‐based solar cells .…”

Section: Introductionmentioning

confidence: 99%

Post‐Treatment Engineering of Vacuum‐Deposited Cs₂NaBiI₆ Double Perovskite Film for Enhanced Photovoltaic Performance

Gao

et al. 2019

Physica Status Solidi (a)

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Lead‐free double perovskite materials have recently shown promising in optoelectronic application. However, the poor solubility of these materials makes them difficult to form a high‐quality thin film via the solution‐processible technology, which leads to the poor photovoltaic performance of a solar cell device. Herein, the vacuum‐evaporated Cs2NaBiI6 double perovskite film with high quality achieved by the post‐treatment engineering is demonstrated. It is found that soaking in isopropyl alcohol (IPA) followed by annealing in dimethyl formamide (DMF) atmosphere can enlarge the size of grains, lower trap‐state density, and remove side product of the Cs2NaBiI6 film. The resulting solar cell devices show a power conversion efficiency (PCE) of 0.21% (VOC = 0.70 V, JSC = 0.91 mA cm−2, and fill factor (FF) = 33%), which is tenfold higher than the control device without post‐treatment (PCE = 0.02%, VOC = 0.49 V, JSC = 0.19 mA cm−2, and FF = 24%). In addition, the device shows robust stability against moisture and oxygen in ambient condition. The vacuum deposition method accompanied with a post‐treatment strategy, in this work, provides an important research direction in improving the quality of a double perovskite film and the PCE of corresponding perovskite solar cells (PSCs).

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“…[ 6–8 ] These stability issues have been extensively studied, with the main focus on the perovskite composition, the device structure, and encapsulation. [ 9–15 ]…”

Section: Figurementioning

confidence: 99%

Directionally Selective Polyhalide Molecular Glue for Stable Inverted Perovskite Solar Cells

Piao

Choi

2020

Solar RRL

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The fundamental instability of hybrid perovskite solar cells originates from the considerable halide vacancies. Furthermore, the local roles of halide vacancies between grain boundaries and grain bulk generally conflict, thus inhibiting complete passivation. To overcome this obstacle, a rational polyhalide ligand, di‐(2‐picolyl)amine triiodide, is designed as a molecular “glue” to achieve comprehensive passivation. Unlike a monohalide ligand, this ligand has multiple iodide ions and a quasiplanar tridentate chelation capability, contributing to directional passivation along the grain boundaries and overall passivation throughout the grain bulk. Using this molecular glue passivation, the best inverted solar cell yields an efficiency of 20.02%. Moreover, the relative stability of this cell in ambient air (≈40% humidity, 800 h aging) and under light‐soaking conditions (500 h aging) is profoundly enhanced by 33.33% and 22.26%, respectively. Herein, important insights into the design of passivating molecules to achieve low‐defect perovskites toward the development of multifunctional devices are provided.

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Chemical sintering reduced grain boundary defects for stable planar perovskite solar cells

Cited by 68 publications

References 50 publications

A Review on Additives for Halide Perovskite Solar Cells

A Review on Additives for Halide Perovskite Solar Cells

Post‐Treatment Engineering of Vacuum‐Deposited Cs₂NaBiI₆ Double Perovskite Film for Enhanced Photovoltaic Performance

Directionally Selective Polyhalide Molecular Glue for Stable Inverted Perovskite Solar Cells

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Chemical sintering reduced grain boundary defects for stable planar perovskite solar cells

Cited by 68 publications

References 50 publications

A Review on Additives for Halide Perovskite Solar Cells

A Review on Additives for Halide Perovskite Solar Cells

Post‐Treatment Engineering of Vacuum‐Deposited Cs2NaBiI6 Double Perovskite Film for Enhanced Photovoltaic Performance

Directionally Selective Polyhalide Molecular Glue for Stable Inverted Perovskite Solar Cells

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Post‐Treatment Engineering of Vacuum‐Deposited Cs₂NaBiI₆ Double Perovskite Film for Enhanced Photovoltaic Performance