p-NiO/ITO transparent heterojunction &amp;#x2014; Preparation and characterization

Jovanov

et al. 2020

Perovskite/silicon tandem solar cells are considered as one of the cost-effective solutions for determining high energy conversion efficiencies. Efficient photon management allows improving light incoupling in solar cells by reducing optical losses. The optics relies upon the interface morphology, and consequently, the growth mechanism of the top cell on the bottom cell is crucial for the implementation of efficient perovskite/silicon tandem solar cells. To describe the interface morphologies of perovskite/silicon tandem solar cells, a three-dimensional surface algorithm is used that allows investigating the perovskite solar cells deposited on the textured crystalline silicon solar cells. We distinguish between two extreme cases in which the film grows only in the direction of the substrate normal or in the direction of the local surface normal. The growth mode has significant influence on the film roughness, the effective thickness of the film, the optics of the solar cell, and the photovoltaic parameters. The optics is investigated by finite-differencetime-domain simulations. The influence of the interface morphology on the photovoltaic parameters is discussed, and guidelines are provided to reach high short-circuit current density and energy conversion efficiency.

Section: Perovskite/silicon Tandem Device Designsupporting

confidence: 88%

Section: Perovskite/silicon Tandem Device Designmentioning

confidence: 99%

Influence of Perovskite Interface Morphology on the Photon Management in Perovskite/Silicon Tandem Solar Cells

Jovanov

et al. 2020

“…Metal-oxide contacts are used for the efficient electron transport/hole blocking layer (ETL) and hole transport/electron blocking layer (HTL) for the color sensors. Doped NiO and ZnO are used as HTL and ETL, 44 as shown in Figure 4a,b. However, sufficiently conductive NiO films exhibit high absorption losses.…”

Section: Device Design and Methods For Optical Wave Propagation Calcu...mentioning

confidence: 99%

Beyond Tristimulus Color Vision with Perovskite-Based Multispectral Sensors

Khan

et al. 2022

In this study, optical multispectral sensors based on perovskite semiconductors have been proposed, simulated, and characterized. The perovskite material system combined with the 3D vertical integration of the sensor channels allow for realizing sensors with high sensitivities and a high spectral resolution. The sensors can be applied in several emerging areas, including biomedical imaging, surveillance, complex motion planning of autonomous robots or vehicles, artificial intelligence, and agricultural applications. The sensor elements can be vertically integrated on a readout electronic to realize sensor arrays and multispectral digital cameras. In this study, three- and six-channel vertically stacked perovskite sensors are optically designed, electromagnetically simulated, and colorimetrically characterized to evaluate the color reproduction. The proposed sensors allow for the implementation of snapshot cameras with high sensitivity. The proposed sensor is compared to other sensor technologies in terms of sensitivity and selectivity.

“…The selected double layer is consistent with layer stacks used by several experimental studies on perovskite solar cells in the superstrate configuration. 23,24 The formation of a front contact on top of the perovskite absorber is complex. A variety of materials and material combinations have been investigated.…”

Section: Perovskite Solar Cell Structurementioning

confidence: 99%

Optics of Perovskite Solar Cell Front Contacts

Hongsingthong

et al. 2019

The front contact has a major impact on the electrical and optical properties of perovskite solar cells. The front contact is part of the junction of the solar cell and must provide lateral charge transport to the terminals and should allow for an efficient light incoupling, while having low optical losses. The complex requirements of the perovskite solar front contact will be described and the optics of the front contact will be investigated. It will be shown that the front contact has a distinct influence on the short-circuit current and energy conversion efficiency. Metal oxide films were investigated as potential front contacts. The incoupling of light in the solar cell is investigated by three-dimensional finite-difference time-domain optical simulations and optical measurements of experimentally realized self-textured zinc oxide films. The zinc oxide films were prepared by metal-organic chemical vapor deposition at low temperatures. Furthermore, the influence of free carrier absorption of metal oxide films on the optics of low bandgap and/or tandem solar cells is investigated. Guidelines are provided on how to choose the doping concentration and thickness of the metal oxide films. Finally, it will be shown that by selecting an optimal front contact design the short-circuit current and energy conversion efficiency can be increased by at least 15%.