scholarly journals High open-circuit voltages in lead-halide perovskite solar cells: experiment, theory and open questions

2019 ◽  
Vol 377 (2152) ◽  
pp. 20180286 ◽  
Author(s):  
Thomas Kirchartz
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Special Focus ◽  
Low Carbon ◽  
Open Questions ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Open Circuit Voltages ◽  
Lead Halide

One of the most significant features of lead-halide perovskites is their ability to have comparably slow recombination despite the fact that these materials are mostly processed from solution at room temperature. The slow recombination allows achieving high open-circuit voltages when the lead-halide perovskite layers are used in solar cells. This perspective discusses the state of the art of our understanding and of experimental data with regard to recombination and open-circuit voltages in lead-halide perovskites. A special focus is put onto open questions that the community has to tackle to design future photovoltaic and optoelectronic devices based on lead-halide perovskites and other semiconductors with similar properties. This article is part of a discussion meeting issue ‘Energy materials for a low carbon future’.

scholarly journals How to Report Record Open‐Circuit Voltages in Lead‐Halide Perovskite Solar Cells

2019 ◽  
Vol 10 (1) ◽  
pp. 1902573 ◽  
Author(s):  
Lisa Krückemeier ◽  
Uwe Rau ◽  
Martin Stolterfoht ◽  
Thomas Kirchartz
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Halide Perovskite ◽  
Open Circuit Voltages ◽  
Lead Halide

Mg-doped TiO2 nanorods improving open-circuit voltages of ammonium lead halide perovskite solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (19) ◽  
pp. 9652-9655 ◽  
Author(s):  
K. Manseki ◽  
T. Ikeya ◽  
A. Tamura ◽  
T. Ban ◽  
T. Sugiura ◽  
...  
Keyword(s):  
Solar Cells ◽  
Hydrothermal Reaction ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Conduction Band Edge ◽  
Microwave Hydrothermal ◽  
Halide Perovskite ◽  
Open Circuit Voltages ◽  
Lead Halide ◽  
Mg Doped

Mg-doped TiO2 nanorods were synthesized from colloidal titanate by a microwave hydrothermal reaction. Use of such TiO2 having an elevated conduction band edge as an electron extracting material for ammonium lead halide perovskite solar cells resulted in a marked improvement of Voc.

scholarly journals Lead-Free Halide Double Perovskites: A Review of the Structural, Optical, and Stability Properties as Well as Their Viability to Replace Lead Halide Perovskites

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 667 ◽  
Author(s):  
Edson Meyer ◽  
Dorcas Mutukwa ◽  
Nyengerai Zingwe ◽  
Raymond Taziwa
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Lead Free ◽  
Double Perovskites ◽  
Stability Properties ◽  
Perovskite Materials ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Light Absorbers ◽  
Lead Halide

Perovskite solar cells employ lead halide perovskite materials as light absorbers. These perovskite materials have shown exceptional optoelectronic properties, making perovskite solar cells a fast-growing solar technology. Perovskite solar cells have achieved a record efficiency of over 20%, which has superseded the efficiency of Gräztel dye-sensitized solar cell (DSSC) technology. Even with their exceptional optical and electric properties, lead halide perovskites suffer from poor stability. They degrade when exposed to moisture, heat, and UV radiation, which has hindered their commercialization. Moreover, halide perovskite materials consist of lead, which is toxic. Thus, exposure to these materials leads to detrimental effects on human health. Halide double perovskites with A2B′B″X6 (A = Cs, MA; B′ = Bi, Sb; B″ = Cu, Ag, and X = Cl, Br, I) have been investigated as potential replacements of lead halide perovskites. This work focuses on providing a detailed review of the structural, optical, and stability properties of these proposed perovskites as well as their viability to replace lead halide perovskites. The triumphs and challenges of the proposed lead-free A2B′B″X6 double perovskites are discussed here in detail.

Mixed cation hybrid lead halide perovskites with enhanced performance and stability

2017 ◽  
Vol 5 (23) ◽  
pp. 11450-11461 ◽  
Author(s):  
Feng Xu ◽  
Taiyang Zhang ◽  
Ge Li ◽  
Yixin Zhao
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Mixed Cation ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Improved Performance ◽  
Lead Halide

The mixed cation lead halide perovskite solar cells exhibited improved performance and enhanced stabilities.

scholarly journals Comment on “Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells”

Science ◽  
2021 ◽  
Vol 371 (6532) ◽  
pp. eabd8014 ◽  
Author(s):  
Sandheep Ravishankar ◽  
Thomas Unold ◽  
Thomas Kirchartz
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Drive Level ◽  
Research Articles ◽  
Trap States ◽  
Perovskite Layer ◽  
Metal Halide Perovskite ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Lead Halide

Ni et al. (Research Articles, 20 March 2020, p. 1352) report bulk trap densities of 1011 cm–3 and an increase in interfacial trap densities by one to four orders of magnitude from drive-level capacitance profiling of lead halide perovskites. From electrostatic arguments, we show that the results are not trap densities but are a consequence of the geometrical capacitance and charge injection into the perovskite layer.

scholarly journals Probing the ionic defect landscape in halide perovskite solar cells

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Sebastian Reichert ◽  
Qingzhi An ◽  
Young-Won Woo ◽  
Aron Walsh ◽  
Yana Vaynzof ◽  
...  
Keyword(s):  
Deep Level ◽  
Critical Role ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Characteristic Energy ◽  
Open Questions ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Transient Spectroscopy ◽  
Ionic Defect

AbstractPoint defects in metal halide perovskites play a critical role in determining their properties and optoelectronic performance; however, many open questions remain unanswered. In this work, we apply impedance spectroscopy and deep-level transient spectroscopy to characterize the ionic defect landscape in methylammonium lead triiodide (MAPbI3) perovskites in which defects were purposely introduced by fractionally changing the precursor stoichiometry. Our results highlight the profound influence of defects on the electronic landscape, exemplified by their impact on the device built-in potential, and consequently, the open-circuit voltage. Even low ion densities can have an impact on the electronic landscape when both cations and anions are considered as mobile. Moreover, we find that all measured ionic defects fulfil the Meyer–Neldel rule with a characteristic energy connected to the underlying ion hopping process. These findings support a general categorization of defects in halide perovskite compounds.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

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