scholarly journals A piperidinium salt stabilizes efficient metal-halide perovskite solar cells

Science ◽  
2020 ◽  
Vol 369 (6499) ◽  
pp. 96-102 ◽  
Author(s):  
Yen-Hung Lin ◽  
Nobuya Sakai ◽  
Peimei Da ◽  
Jiaying Wu ◽  
Harry C. Sansom ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Ambient Atmosphere ◽  
Full Spectrum ◽  
Encapsulated Cells ◽  
Cell Efficiency ◽  
Hybrid Perovskite ◽  
Metal Halide Perovskite ◽  
Compositional Segregation

Longevity has been a long-standing concern for hybrid perovskite photovoltaics. We demonstrate high-resilience positive-intrinsic-negative perovskite solar cells by incorporating a piperidinium-based ionic compound into the formamidinium-cesium lead-trihalide perovskite absorber. With the bandgap tuned to be well suited for perovskite-on-silicon tandem cells, this piperidinium additive enhances the open-circuit voltage and cell efficiency. This additive also retards compositional segregation into impurity phases and pinhole formation in the perovskite absorber layer during aggressive aging. Under full-spectrum simulated sunlight in ambient atmosphere, our unencapsulated and encapsulated cells retain 80 and 95% of their peak and post-burn-in efficiencies for 1010 and 1200 hours at 60° and 85°C, respectively. Our analysis reveals detailed degradation routes that contribute to the failure of aged cells.

scholarly journals Electrodeposited PEDOT:PSS-Al2O3 Improves the Steady-State Efficiency of Inverted Perovskite Solar Cells

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4162
Author(s):  
Eider A. Erazo ◽  
Martín Gómez ◽  
Leonardo Rios ◽  
Edgar J. Patiño ◽  
María T. Cortés ◽  
...  
Keyword(s):  
Solar Cells ◽  
Steady State ◽  
Perovskite Solar Cells ◽  
Atomic Layer ◽  
Open Circuit ◽  
Electrochemical Technique ◽  
Additional Energy ◽  
Final Annealing ◽  
Solar Cell Performance ◽  
Cell Efficiency

The atomic layer deposition (ALD) of Al2O3 between perovskite and the hole transporting material (HTM) PEDOT:PSS has previously been shown to improve the efficiency of perovskite solar cells. However, the costs associated with this technique make it unaffordable. In this work, the deposition of an organic–inorganic PEDOT:PSS-Cl-Al2O3 bilayer is performed by a simple electrochemical technique with a final annealing step, and the performance of this material as HTM in inverted perovskite solar cells is studied. It was found that this material (PEDOT:PSS-Al2O3) improves the solar cell performance by the same mechanisms as Al2O3 obtained by ALD: formation of an additional energy barrier, perovskite passivation, and increase in the open-circuit voltage (Voc) due to suppressed recombination. As a result, the incorporation of the electrochemical Al2O3 increased the cell efficiency from 12.1% to 14.3%. Remarkably, this material led to higher steady-state power conversion efficiency, improving a recurring problem in solar cells.

scholarly journals Interfacial Voids Trigger Carbon-Based, All-Inorganic CsPbIBr2 Perovskite Solar Cells with Photovoltage Exceeding 1.33 V

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Weidong Zhu ◽  
Zeyang Zhang ◽  
Dandan Chen ◽  
Wenming Chai ◽  
Dazheng Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Interface Design ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Charge Carriers ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Ambient Atmosphere ◽  
Beneficial Effects ◽  
Carbon Based

AbstractA novel interface design is proposed for carbon-based, all-inorganic CsPbIBr2 perovskite solar cells (PSCs) by introducing interfacial voids between TiO2 electron transport layer and CsPbIBr2 absorber. Compared with the general interfacial engineering strategies, this design exempts any extra modification layer in final PSC. More importantly, the interfacial voids produced by thermal decomposition of 2-phenylethylammonium iodide trigger three beneficial effects. First, they promote the light scattering in CsPbIBr2 film and thereby boost absorption ability of the resulting CsPbIBr2 PSCs. Second, they suppress recombination of charge carriers and thus reduce dark saturation current density (J0) of the PSCs. Third, interfacial voids enlarge built-in potential (Vbi) of the PSCs, awarding increased driving force for dissociating photo-generated charge carriers. Consequently, the PSC yields the optimized efficiency of 10.20% coupled with an open-circuit voltage (Voc) of 1.338 V. The Voc achieved herein represents the best value among CsPbIBr2 PSCs reported earlier. Meanwhile, the non-encapsulated PSCs exhibit an excellent stability against light, thermal, and humidity stresses, since it remains ~ 97% or ~ 94% of its initial efficiency after being heated at 85 °C for 12 h or stored in ambient atmosphere with relative humidity of 30–40% for 60 days, respectively.

scholarly journals 2D/3D Perovskite Engineering Eliminates Interfacial Recombination Losses in Hybrid Perovskite Solar Cells

2020 ◽  
Author(s):  
Albertus Adrian Sutanto ◽  
Pietro Caprioglio ◽  
Nikita Drigo ◽  
Yvonne Hofstetter ◽  
Ines Garcia Benito ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Density ◽  
Photoelectron Spectroscopy ◽  
Perovskite Solar Cells ◽  
Three Dimensional ◽  
Open Circuit ◽  
Surface Stability ◽  
Hybrid Perovskite ◽  
Exact Function ◽  
Interfacial Recombination

Abstract Engineering two-dimensional (2D) / three-dimensional (3D) perovskites has emerged as an attractive route to efficient and durable perovskite solar cells. Beyond improving the surface stability of the 3D layer and acting as a trap passivation agent, the exact function of 2D/3D device interface remains vague. Here, we provide evidence that 2D/3D perovskite interface that forms a p-n junction is capable to reduce the electron density at the hole-transporting layer interface and ultimately suppress interfacial recombination. By a novel ultraviolet photoelectron spectroscopy (UPS) depth-profiling technique, we show that engineering of the 2D organic cations, in this case by simply varying the halide counter ions in thiophene methylammonium-salts, modifies the 2D/3D perovskite energy alignment. These measurements enable the true identification of the energetic across the 2D/3D interface, so far unclear. When integrated in solar cells, due to the electron blocking nature of the 2D layer, the optimized 2D/3D structures suppress the interfacial recombination losses, leading to open-circuit voltage (VOC) which approaches the potential internal Quasi-Fermi Level Splitting (QFLS) voltage of the perovskite absorber. The devices exhibit an improved fill factor (FF) driven by the enhanced hole extraction efficiency and reduced electron density at the 2D/3D interface. We thus identify the essential parameters and energetic alignment scenario required for 2D/3D perovskite systems in order to surpass the current limitations of hybrid perovskite solar cell performances.

scholarly journals Maximizing the external radiative efficiency of hybrid perovskite solar cells

2020 ◽  
Vol 92 (5) ◽  
pp. 697-706
Author(s):  
Dane W. deQuilettes ◽  
Madeleine Laitz ◽  
Roberto Brenes ◽  
Benjia Dou ◽  
Brandon T. Motes ◽  
...  
Keyword(s):  
Solar Cells ◽  
Radiative Recombination ◽  
Low Voltage ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Thermodynamic Efficiency ◽  
Perovskite Layer ◽  
Radiative Efficiency ◽  
Historical Progress ◽  
Hybrid Perovskite

AbstractDespite rapid advancements in power conversion efficiency in the last decade, perovskite solar cells still perform below their thermodynamic efficiency limits. Non-radiative recombination, in particular, has limited the external radiative efficiency and open circuit voltage in the highest performing devices. We review the historical progress in enhancing perovskite external radiative efficiency and determine key strategies for reaching high optoelectronic quality. Specifically, we focus on non-radiative recombination within the perovskite layer and highlight novel approaches to reduce energy losses at interfaces and through parasitic absorption. By strategically targeting defects, it is likely that the next set of record-performing devices with ultra-low voltage losses will be achieved.

Universal energy level tailoring of self-organized hole extraction layers in organic solar cells and organic–inorganic hybrid perovskite solar cells

2016 ◽  
Vol 9 (3) ◽  
pp. 932-939 ◽  
Author(s):  
Kyung-Geun Lim ◽  
Soyeong Ahn ◽  
Young-Hoon Kim ◽  
Yabing Qi ◽  
Tae-Woo Lee
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Inorganic Hybrid ◽  
Self Organized ◽  
Hybrid Perovskite ◽  
Device Lifetime

Tailoring the interface energetics between a polymeric hole extraction layer (HEL) and a photoactive layer (PAL) in organic photovoltaics (OPVs) and organic–inorganic hybrid perovskite solar cells (PrSCs) is very important to maximize open circuit voltage (Voc), power conversion efficiency (PCE), and device lifetime.

Brookite TiO2 as a low-temperature solution-processed mesoporous layer for hybrid perovskite solar cells

2015 ◽  
Vol 3 (42) ◽  
pp. 20952-20957 ◽  
Author(s):  
Atsushi Kogo ◽  
Yoshitaka Sanehira ◽  
Masashi Ikegami ◽  
Tsutomu Miyasaka
Keyword(s):  
Solar Cells ◽  
Fill Factor ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Solution Process ◽  
Open Circuit ◽  
Free Solution ◽  
Crystalline Layer ◽  
Hybrid Perovskite ◽  
Temperature Solution

A highly crystalline layer of brookite TiO2 was prepared by a sinter-free solution process (<150 °C) as an efficient mesoporous electron collector for perovskite solar cells. In comparison with anatase TiO2 mesostructure, higher open-circuit voltage and fill factor are obtained.

scholarly journals Carrier trapping and recombination: the role of defect physics in enhancing the open circuit voltage of metal halide perovskite solar cells

2016 ◽  
Vol 9 (11) ◽  
pp. 3472-3481 ◽  
Author(s):  
Tomas Leijtens ◽  
Giles E. Eperon ◽  
Alex J. Barker ◽  
Giulia Grancini ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Time Scales ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Metal Halide ◽  
Trapped Electrons ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

We show that trapped electrons recombine with free holes unexpectedly slowly, on microsecond time scales, relaxing the limit on obtainable open circuit voltage.

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