The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Alexander Colsmann - One of the best experts on this subject based on the ideXlab platform.
-
Understanding the External Quantum Efficiency of Organic Homo‐Tandem Solar Cells Utilizing a Three‐Terminal Device Architecture
Advanced Energy Materials, 2015Co-Authors: Daniel Bahro, Manuel Koppitz, Adrian Mertens, Konstantin Glaser, Jan Mescher, Alexander ColsmannAbstract:A fundamental analysis of the external quantum efficiency (EQE) of organic tandem solar cells with equal absorbers in both subcells (homo-tandem solar cells) is presented. Providing direct access to both subcells by introducing a conductive intermediate polymer electrode into the recombination zone, without changing the optical and electric Device properties, the three-Terminal Device becomes a proxy to the two-Terminal tandem solar cell properties. From the spectrally resolved EQE of the subcells in three-Terminal configuration wavelength and intensity of suitable bias light as well as bias voltage are determined that in turn allow for accurate EQE measurements of the common two-Terminal tandem solar cells. Theoretic considerations allow the prediction of the tandem solar cell's EQE from its subcells' EQEs as well as the prediction of the tandem cell EQE under monochromatic bias light illumination being in excellent agreement with experimental results. All findings discussed herein can be applied to more common hetero-tandem solar cell architectures likewise.
Daniel Bahro - One of the best experts on this subject based on the ideXlab platform.
-
Understanding the External Quantum Efficiency of Organic Homo‐Tandem Solar Cells Utilizing a Three‐Terminal Device Architecture
Advanced Energy Materials, 2015Co-Authors: Daniel Bahro, Manuel Koppitz, Adrian Mertens, Konstantin Glaser, Jan Mescher, Alexander ColsmannAbstract:A fundamental analysis of the external quantum efficiency (EQE) of organic tandem solar cells with equal absorbers in both subcells (homo-tandem solar cells) is presented. Providing direct access to both subcells by introducing a conductive intermediate polymer electrode into the recombination zone, without changing the optical and electric Device properties, the three-Terminal Device becomes a proxy to the two-Terminal tandem solar cell properties. From the spectrally resolved EQE of the subcells in three-Terminal configuration wavelength and intensity of suitable bias light as well as bias voltage are determined that in turn allow for accurate EQE measurements of the common two-Terminal tandem solar cells. Theoretic considerations allow the prediction of the tandem solar cell's EQE from its subcells' EQEs as well as the prediction of the tandem cell EQE under monochromatic bias light illumination being in excellent agreement with experimental results. All findings discussed herein can be applied to more common hetero-tandem solar cell architectures likewise.
H S P Wong - One of the best experts on this subject based on the ideXlab platform.
-
one dimensional thickness scaling study of phase change material hbox ge _ 2 hbox sb _ 2 hbox te _ 5 using a pseudo 3 Terminal Device
IEEE Transactions on Electron Devices, 2011Co-Authors: Sangbum Kim, Byoungjae Bae, Yuan Zhang, Rakesh Jeyasingh, Youngkuk Kim, Ingyu Baek, S S Park, Seokwoo Nam, H S P WongAbstract:To address the scalability of phase change memory (PCM), we study a 1-D thickness scaling effect on threshold switching voltage (Vth), Vth drift, high resistance state (RESET) resistance (RRESET) drift, and crystallization temperature (Tcrys). We use a pseudo three-Terminal Device to accurately correlate the amorphous region thickness to the observed characteristics. The pseudo 3-Terminal Device is a fully functional PCM cell and enables 1-D thickness scaling study down to 6 nm without the need for ultrafine lithography. Vth scales down to 0.65-0.5 V (at 25°C-75°C) for 6-nm-thick Ge2Sb2Te5 (GST), showing that stable read operation is possible in scaled PCM Devices. The Vth drift measurement suggests that Vth drift can be attributed to threshold switching field (Eth) drift, whereas Vth0, i.e., Vth at zero thickness, stays almost constant. RRESET drift shows no dependence on the amorphous GST thickness. Tcrys is ~175°C for the Device with 6-nm-thick GST, compared with ~145°C of thick GST. From the 1-D scaling study, no significant hurdles against scaling are found down to 6 nm. Further study of scaling effect on endurance and development of scalable selection Device is needed to assess the ultimate scalability of PCM.
Adrian Mertens - One of the best experts on this subject based on the ideXlab platform.
-
Understanding the External Quantum Efficiency of Organic Homo‐Tandem Solar Cells Utilizing a Three‐Terminal Device Architecture
Advanced Energy Materials, 2015Co-Authors: Daniel Bahro, Manuel Koppitz, Adrian Mertens, Konstantin Glaser, Jan Mescher, Alexander ColsmannAbstract:A fundamental analysis of the external quantum efficiency (EQE) of organic tandem solar cells with equal absorbers in both subcells (homo-tandem solar cells) is presented. Providing direct access to both subcells by introducing a conductive intermediate polymer electrode into the recombination zone, without changing the optical and electric Device properties, the three-Terminal Device becomes a proxy to the two-Terminal tandem solar cell properties. From the spectrally resolved EQE of the subcells in three-Terminal configuration wavelength and intensity of suitable bias light as well as bias voltage are determined that in turn allow for accurate EQE measurements of the common two-Terminal tandem solar cells. Theoretic considerations allow the prediction of the tandem solar cell's EQE from its subcells' EQEs as well as the prediction of the tandem cell EQE under monochromatic bias light illumination being in excellent agreement with experimental results. All findings discussed herein can be applied to more common hetero-tandem solar cell architectures likewise.
Konstantin Glaser - One of the best experts on this subject based on the ideXlab platform.
-
Understanding the External Quantum Efficiency of Organic Homo‐Tandem Solar Cells Utilizing a Three‐Terminal Device Architecture
Advanced Energy Materials, 2015Co-Authors: Daniel Bahro, Manuel Koppitz, Adrian Mertens, Konstantin Glaser, Jan Mescher, Alexander ColsmannAbstract:A fundamental analysis of the external quantum efficiency (EQE) of organic tandem solar cells with equal absorbers in both subcells (homo-tandem solar cells) is presented. Providing direct access to both subcells by introducing a conductive intermediate polymer electrode into the recombination zone, without changing the optical and electric Device properties, the three-Terminal Device becomes a proxy to the two-Terminal tandem solar cell properties. From the spectrally resolved EQE of the subcells in three-Terminal configuration wavelength and intensity of suitable bias light as well as bias voltage are determined that in turn allow for accurate EQE measurements of the common two-Terminal tandem solar cells. Theoretic considerations allow the prediction of the tandem solar cell's EQE from its subcells' EQEs as well as the prediction of the tandem cell EQE under monochromatic bias light illumination being in excellent agreement with experimental results. All findings discussed herein can be applied to more common hetero-tandem solar cell architectures likewise.
