The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
I. M. Dharmadasa - One of the best experts on this subject based on the ideXlab platform.
-
sulphidation of electrodeposited cuprous oxide thin films for photovoltaic applications
Solar Energy Materials and Solar Cells, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Abstract Electrodeposited cuprous oxide thin films on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker films having different photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker films under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker films. Spectral response measurements revealed that most of the light darker films produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker films produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker films resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin films was not changed, however, the interfacial characteristics of the solar cell structure were modified.
-
Sulphidation of electrodeposited cuprous oxide thin "lms for photovoltaic applications
Solar Energy Materials, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Electrodeposited cuprous oxide thin "lms on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker "lms having di!erent photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker "lms under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker "lms. Spectral response measurements revealed that most of the light darker "lms produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker "lms produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker "lms resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin "lms was not changed, however, the interfacial characteristics of the solar cell structure were modi"ed.
R P Wijesundara - One of the best experts on this subject based on the ideXlab platform.
-
sulphidation of electrodeposited cuprous oxide thin films for photovoltaic applications
Solar Energy Materials and Solar Cells, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Abstract Electrodeposited cuprous oxide thin films on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker films having different photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker films under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker films. Spectral response measurements revealed that most of the light darker films produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker films produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker films resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin films was not changed, however, the interfacial characteristics of the solar cell structure were modified.
-
Sulphidation of electrodeposited cuprous oxide thin "lms for photovoltaic applications
Solar Energy Materials, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Electrodeposited cuprous oxide thin "lms on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker "lms having di!erent photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker "lms under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker "lms. Spectral response measurements revealed that most of the light darker "lms produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker "lms produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker "lms resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin "lms was not changed, however, the interfacial characteristics of the solar cell structure were modi"ed.
Takuji Takahashi - One of the best experts on this subject based on the ideXlab platform.
-
Photovoltage Decay Measurements by Photo-Assisted Kelvin Probe Force Microscopy on Cu(In,Ga)Se2 Solar Cells
IEEE Journal of Photovoltaics, 2019Co-Authors: Hyeondeuk Yong, Takashi Minemoto, Takuji TakahashiAbstract:Photovoltage measurements are performed on Cu(In,Ga)Se2 (CIGS) solar cells with various Ga composition ratios [Ga/(Ga + In)] using photo-assisted Kelvin probe force microscopy (P-KFM). From the temporally-averaged Photovoltages acquired by P-KFM under intermittent light illumination at various frequencies, photovoltage decay phenomena resulting from different carrier recombination processes are investigated. The sample with high Ga composition in CIGS exhibits an elongated time constant for the slow recombination process and an increased contribution ratio of the fast recombination process in the entire photovoltage decay processes. The slow process is attributed to the recombination of spatially separated electrons and holes in the surface n-type layer and CIGS bulk layer, respectively, or to the existence of the electron trap near the CdS/CIGS interface. On the other hand, the fast process is attributed to direct recombination of electrons and holes in the CIGS bulk. The influence of the carrier separation effect on photo-carrier recombination around grain boundaries in the CIGS solar cells is also discussed.
-
dependence of photovoltage on incident photon energies investigated by photo assisted kelvin probe force microscopy on cu in ga se 2 solar cells
World Conference on Photovoltaic Energy Conversion, 2018Co-Authors: Hyeondeuk Yong, Takashi Minemoto, Takuji TakahashiAbstract:Dependence of photovoltage on photon energy of incident light was investigated on Cu(In,Ga)Se 2 [CIGS] solar cells by photo-assisted Kelvin probe force microscopy (P-KFM). As a result, we found that the photovoltage gradually increased as an increase of photon energy when the excess energy from the minimum bandgap was small, while the photovoltage began to decrease when the photon energy exceeded the bandgap energy by a certain value. The relationship between such features and V-shaped band grading in CIGS was discussed in comparison with some numerical simulations.
-
Photovoltage decay processes in Cu(In, Ga)Se2 solar cells studied by photo-assisted Kelvin probe force microscopy
2013 IEEE 39th Photovoltaic Specialists Conference (PVSC), 2013Co-Authors: Hyeondeuk Yong, Takashi Minemoto, Yu Nakajima, Takuji TakahashiAbstract:The temporally-averaged Photovoltages were measured on Cu(In, Ga)Se2 [CIGS] solar cells under the intermittent light excitation by photo-assisted Kelvin probe force microscopy to evaluated a time constant τ for photovoltage decay and a contribution ratio r of fast carrier recombination process in the entire recombination processes. The results indicate that the sample with higher Ga content exhibited longer τ and larger r, from which we have investigated the influences of both the carrier transport across the potential barrier and the carrier separation around the grain boundary on the entire photo-carrier recombination processes.
K.t.l De Silva - One of the best experts on this subject based on the ideXlab platform.
-
sulphidation of electrodeposited cuprous oxide thin films for photovoltaic applications
Solar Energy Materials and Solar Cells, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Abstract Electrodeposited cuprous oxide thin films on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker films having different photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker films under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker films. Spectral response measurements revealed that most of the light darker films produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker films produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker films resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin films was not changed, however, the interfacial characteristics of the solar cell structure were modified.
-
Sulphidation of electrodeposited cuprous oxide thin "lms for photovoltaic applications
Solar Energy Materials, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Electrodeposited cuprous oxide thin "lms on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker "lms having di!erent photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker "lms under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker "lms. Spectral response measurements revealed that most of the light darker "lms produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker "lms produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker "lms resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin "lms was not changed, however, the interfacial characteristics of the solar cell structure were modi"ed.
L D R D Perera - One of the best experts on this subject based on the ideXlab platform.
-
sulphidation of electrodeposited cuprous oxide thin films for photovoltaic applications
Solar Energy Materials and Solar Cells, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Abstract Electrodeposited cuprous oxide thin films on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker films having different photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker films under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker films. Spectral response measurements revealed that most of the light darker films produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker films produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker films resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin films was not changed, however, the interfacial characteristics of the solar cell structure were modified.
-
Sulphidation of electrodeposited cuprous oxide thin "lms for photovoltaic applications
Solar Energy Materials, 2000Co-Authors: R P Wijesundara, L D R D Perera, K D Jayasuriya, A P Samantilleke, W. Siripala, K.t.l De Silva, I. M. DharmadasaAbstract:Electrodeposited cuprous oxide thin "lms on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. Both methods produced light darker and darker "lms having di!erent photovoltaic characteristics in a solar cell structure. The Photovoltages produced by the light darker "lms under AM 1.5 illumination was negative as compared to the positive Photovoltages produced by the darker "lms. Spectral response measurements revealed that most of the light darker "lms produced positive Photovoltages in the shorter wavelengths and negative Photovoltages in the longer wavelengths. However, some of the light darker "lms produced only the negative photovoltage for the entire spectral range and their photovoltaic properties were comparatively better. Darker "lms resulted in only the positive Photovoltages in the entire spectral range. As a result of the sulphidation, the bulk crystal structure of the cuprous oxide thin "lms was not changed, however, the interfacial characteristics of the solar cell structure were modi"ed.