scholarly journals Solar Cells: Quantifying Quasi‐Fermi Level Splitting and Mapping its Heterogeneity in Atomically Thin Transition Metal Dichalcogenides (Adv. Mater. 25/2019)

2019 ◽  
Vol 31 (25) ◽  
pp. 1970180
Author(s):  
Mike Tebyetekerwa ◽  
Jian Zhang ◽  
Kun Liang ◽  
The Duong ◽  
Guru Prakash Neupane ◽  
...  
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
Fermi Level ◽  
Transition Metal Dichalcogenides ◽  
Quasi Fermi Level ◽  
Level Splitting ◽  
Metal Dichalcogenides

Quantifying Quasi‐Fermi Level Splitting and Mapping its Heterogeneity in Atomically Thin Transition Metal Dichalcogenides

2019 ◽  
Vol 31 (25) ◽  
pp. 1900522 ◽  
Author(s):  
Mike Tebyetekerwa ◽  
Jian Zhang ◽  
Kun Liang ◽  
The Duong ◽  
Guru Prakash Neupane ◽  
...  
Keyword(s):  
Transition Metal ◽  
Fermi Level ◽  
Transition Metal Dichalcogenides ◽  
Quasi Fermi Level ◽  
Level Splitting ◽  
Metal Dichalcogenides

scholarly journals High-specific-power flexible transition metal dichalcogenide solar cells

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Koosha Nassiri Nazif ◽  
Alwin Daus ◽  
Jiho Hong ◽  
Nayeun Lee ◽  
Sam Vaziri ◽  
...  
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
Fermi Level ◽  
Transition Metal Dichalcogenides ◽  
Specific Power ◽  
Transition Metal Dichalcogenide ◽  
Fermi Level Pinning ◽  
High Specific Power ◽  
Metal Dichalcogenides ◽  
Transfer Method

AbstractSemiconducting transition metal dichalcogenides (TMDs) are promising for flexible high-specific-power photovoltaics due to their ultrahigh optical absorption coefficients, desirable band gaps and self-passivated surfaces. However, challenges such as Fermi-level pinning at the metal contact–TMD interface and the inapplicability of traditional doping schemes have prevented most TMD solar cells from exceeding 2% power conversion efficiency (PCE). In addition, fabrication on flexible substrates tends to contaminate or damage TMD interfaces, further reducing performance. Here, we address these fundamental issues by employing: (1) transparent graphene contacts to mitigate Fermi-level pinning, (2) MoOx capping for doping, passivation and anti-reflection, and (3) a clean, non-damaging direct transfer method to realize devices on lightweight flexible polyimide substrates. These lead to record PCE of 5.1% and record specific power of 4.4 W g−1 for flexible TMD (WSe2) solar cells, the latter on par with prevailing thin-film solar technologies cadmium telluride, copper indium gallium selenide, amorphous silicon and III-Vs. We further project that TMD solar cells could achieve specific power up to 46 W g−1, creating unprecedented opportunities in a broad range of industries from aerospace to wearable and implantable electronics.

scholarly journals On the Relation between the Open‐Circuit Voltage and Quasi‐Fermi Level Splitting in Efficient Perovskite Solar Cells

2019 ◽  
Vol 9 (33) ◽  
pp. 1901631 ◽  
Author(s):  
Pietro Caprioglio ◽  
Martin Stolterfoht ◽  
Christian M. Wolff ◽  
Thomas Unold ◽  
Bernd Rech ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Quasi Fermi Level ◽  
Level Splitting

scholarly journals Ion Movement Explains Huge V OC Increase despite Almost Unchanged Internal Quasi‐Fermi‐Level Splitting in Planar Perovskite Solar Cells

2021 ◽  
pp. 2001104
Author(s):  
Jan Herterich ◽  
Moritz Unmüssig ◽  
Georgios Loukeris ◽  
Markus Kohlstädt ◽  
Uli Würfel
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Perovskite Solar Cells ◽  
Ion Movement ◽  
Quasi Fermi Level ◽  
Level Splitting

Photoluminescence Quantum Efficiency, Carrier Lifetime and Quasi-Fermi Level Splitting in Highly-efficient Perovskite Solar Cells

2019 ◽  
Author(s):  
Thomas Unold ◽  
Martin Stolterfoht ◽  
Christian Wolff ◽  
Pietro Caprioglio ◽  
Jose Marquez-Prieto ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Quantum Efficiency ◽  
Carrier Lifetime ◽  
Perovskite Solar Cells ◽  
Highly Efficient ◽  
Quasi Fermi Level ◽  
Level Splitting

scholarly journals Interface Engineering for Perovskite Solar Cells Based on 2D-Materials: A Physics Point of View

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5843
Author(s):  
Rosaria Verduci ◽  
Antonio Agresti ◽  
Valentino Romano ◽  
Giovanna D’Angelo
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
2D Materials ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Point Of View ◽  
Physical Mechanisms ◽  
Metal Dichalcogenides

The last decade has witnessed the advance of metal halide perovskites as a promising low-cost and efficient class of light harvesters used in solar cells (SCs). Remarkably, the efficiency of lab-scale perovskite solar cells (PSCs) reached a power conversion efficiency of 25.5% in just ~10 years of research, rivalling the current record of 26.1% for Si-based PVs. To further boost the performances of PSCs, the use of 2D materials (such as graphene, transition metal dichalcogenides and transition metal carbides, nitrides and carbonitrides) has been proposed, thanks to their remarkable optoelectronic properties (that can be tuned with proper chemical composition engineering) and chemical stability. In particular, 2D materials have been demonstrated as promising candidates for (i) accelerating hot carrier transfer across the interfaces between the perovskite and the charge extraction layers; (ii) improving the crystallization of the perovskite layers (when used as additives in the precursor solution); (iii) favoring electronic bands alignment through tuning of the work function. In this mini-review, we discuss the physical mechanisms underlying the increased efficiency of 2D material-based PSCs, focusing on the three aforementioned effects.

Highly-efficient heterojunction solar cells based on two-dimensional tellurene and transition metal dichalcogenides

2019 ◽  
Vol 7 (13) ◽  
pp. 7430-7436 ◽  
Author(s):  
Kai Wu ◽  
Huanhuan Ma ◽  
Yunzhi Gao ◽  
Wei Hu ◽  
Jinlong Yang
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
Charge Separation ◽  
Transition Metal Dichalcogenides ◽  
Band Alignment ◽  
Type Ii ◽  
Two Dimensional ◽  
Heterojunction Solar Cells ◽  
Highly Efficient ◽  
Metal Dichalcogenides

Tellurene and TMDs show desirable type II band alignment for constructing highly-efficient heterojunction solar cells with strong charge separation and enhanced sunlight absorption.

Role of graphene and transition metal dichalcogenides as hole transport layer and counter electrode in solar cells

2019 ◽  
Vol 44 (3) ◽  
pp. 1464-1487 ◽  
Author(s):  
Muhammad Zahir Iqbal ◽  
Jameel‐Un Nabi ◽  
Saman Siddique ◽  
Hafiz Taimoor Ahmed Awan ◽  
Syed Shabhi Haider ◽  
...  
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
Counter Electrode ◽  
Transition Metal Dichalcogenides ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Metal Dichalcogenides

Quantification of spatial inhomogeneity in perovskite solar cells by hyperspectral luminescence imaging

2016 ◽  
Vol 9 (7) ◽  
pp. 2286-2294 ◽  
Author(s):  
Gilbert El-Hajje ◽  
Cristina Momblona ◽  
Lidón Gil-Escrig ◽  
Jorge Ávila ◽  
Thomas Guillemot ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Hyperspectral Imaging ◽  
Perovskite Solar Cells ◽  
Spatial Inhomogeneity ◽  
Luminescence Imaging ◽  
Quasi Fermi Level ◽  
Level Splitting ◽  
Spatial Inhomogeneities

Perovskite solar cells are analyzed by photo- and electroluminescence hyperspectral imaging. Significant spatial inhomogeneities in the quasi-Fermi level splitting are observed.

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