Organometal halide perovskite solar cells have evolved in an exponential manner in the two key ar... more Organometal halide perovskite solar cells have evolved in an exponential manner in the two key areas of efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet was stability, which has been limiting practical application, but now the state of the art is promising, being measured in thousands of hours. These improvements have been achieved through the application of different materials, interfaces and device architecture optimizations, especially after the investigation of hole conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost and easy device fabrication methods. However, this work is still far from complete. There are various issues associated with the degradation of Omh-perovskite, and the interface and device instability which must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in stability and practical outdoor applications of Omh-PSCs. For successful small and large scale applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The causes of failure and associated mechanisms of device degradation, followed by the origins of degradation, approaches to improve stability, and methods and protocols are discussed in detail and form the main focus of this review article.
A Cu 2 O/CuO heterostructure modified with CuS is proposed as a highly promising and stable photo... more A Cu 2 O/CuO heterostructure modified with CuS is proposed as a highly promising and stable photocathode for solar hydrogen production. The Cu 2 O/CuO/CuS heterostructure was synthesized by in situ growth of Cu 2 O/CuO via simple electrodeposition of Cu film followed by annealing in air, and then the surfaces of the heterostructure were sequentially modified by loading CuS via a successive ion layer adsorption and reaction (SILAR) approach. Experimental evidence, including Raman, XANES/EXAFS and XPS spectra, is presented for the interfacial reaction between CuS and Cu 2 O/CuO. The optimized Cu 2 O/CuO/CuS photocathode provides a remarkably enhanced photocurrent density of À5.4 mA cm À2 (i.e. >2.5 times than that of bare Cu 2 O/CuO) at 0 V vs. RHE under standard AM 1.5 light illumination. Due to the bicatalytic effects in suppressing electron–hole recombination, a further increase in photocurrent density to À5.7 mA cm À2 was noticed after decorating the Cu 2 O/CuO surface with both CuS and Pt. To the best of our knowledge, this is the highest performance yet reported for a cocatalyst modified Cu 2 O/ CuO photoelectrode for solar water splitting. More importantly, the Cu 2 O/CuO heterostructure modified with optimum CuS afforded an impressive solar conversion efficiency of ABPE% ¼ 3.6%, which is a greater than fourfold increase compared to the bare Cu 2 O/CuO. The stability of the bare Cu 2 O/CuO photocathode showed about a 44% decrease in initial photocurrent density within 1 h, whereas 85% and 92% of the initial photocurrent was maintained after 1 h when the photocathode was modified with CuS and with both CuS and Pt, respectively. This highly enhanced photoelectrochemical property is attributed to the fast transfer of photogenerated electrons resulting in suppressed electron–hole recombination and the synergistic effect of a heterojunction in light absorption and charge separation. This work demonstrates a facile strategy and potential use of low cost CuS as an efficient cocatalyst for solar hydrogen production that can be applicable in the general field of energy conversion.
Organometal halide perovskite solar cells have evolved in an exponential manner in the two key ar... more Organometal halide perovskite solar cells have evolved in an exponential manner in the two key areas of efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet was stability, which has been limiting practical application, but now the state of the art is promising, being measured in thousands of hours. These improvements have been achieved through the application of different materials, interfaces and device architecture optimizations, especially after the investigation of hole conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost and easy device fabrication methods. However, this work is still far from complete. There are various issues associated with the degradation of Omh-perovskite, and the interface and device instability which must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in stability and practical outdoor applications of Omh-PSCs. For successful small and large scale applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The causes of failure and associated mechanisms of device degradation, followed by the origins of degradation, approaches to improve stability, and methods and protocols are discussed in detail and form the main focus of this review article.
Organometal halide perovskite solar cells have evolved in an exponential manner in the two key ar... more Organometal halide perovskite solar cells have evolved in an exponential manner in the two key areas of efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet was stability, which has been limiting practical application, but now the state of the art is promising, being measured in thousands of hours. These improvements have been achieved through the application of different materials, interfaces and device architecture optimizations, especially after the investigation of hole conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost and easy device fabrication methods. However, this work is still far from complete. There are various issues associated with the degradation of Omh-perovskite, and the interface and device instability which must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in stability and practical outdoor applications of Omh-PSCs. For successful small and large scale applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The causes of failure and associated mechanisms of device degradation, followed by the origins of degradation, approaches to improve stability, and methods and protocols are discussed in detail and form the main focus of this review article.
A Cu 2 O/CuO heterostructure modified with CuS is proposed as a highly promising and stable photo... more A Cu 2 O/CuO heterostructure modified with CuS is proposed as a highly promising and stable photocathode for solar hydrogen production. The Cu 2 O/CuO/CuS heterostructure was synthesized by in situ growth of Cu 2 O/CuO via simple electrodeposition of Cu film followed by annealing in air, and then the surfaces of the heterostructure were sequentially modified by loading CuS via a successive ion layer adsorption and reaction (SILAR) approach. Experimental evidence, including Raman, XANES/EXAFS and XPS spectra, is presented for the interfacial reaction between CuS and Cu 2 O/CuO. The optimized Cu 2 O/CuO/CuS photocathode provides a remarkably enhanced photocurrent density of À5.4 mA cm À2 (i.e. >2.5 times than that of bare Cu 2 O/CuO) at 0 V vs. RHE under standard AM 1.5 light illumination. Due to the bicatalytic effects in suppressing electron–hole recombination, a further increase in photocurrent density to À5.7 mA cm À2 was noticed after decorating the Cu 2 O/CuO surface with both CuS and Pt. To the best of our knowledge, this is the highest performance yet reported for a cocatalyst modified Cu 2 O/ CuO photoelectrode for solar water splitting. More importantly, the Cu 2 O/CuO heterostructure modified with optimum CuS afforded an impressive solar conversion efficiency of ABPE% ¼ 3.6%, which is a greater than fourfold increase compared to the bare Cu 2 O/CuO. The stability of the bare Cu 2 O/CuO photocathode showed about a 44% decrease in initial photocurrent density within 1 h, whereas 85% and 92% of the initial photocurrent was maintained after 1 h when the photocathode was modified with CuS and with both CuS and Pt, respectively. This highly enhanced photoelectrochemical property is attributed to the fast transfer of photogenerated electrons resulting in suppressed electron–hole recombination and the synergistic effect of a heterojunction in light absorption and charge separation. This work demonstrates a facile strategy and potential use of low cost CuS as an efficient cocatalyst for solar hydrogen production that can be applicable in the general field of energy conversion.
Organometal halide perovskite solar cells have evolved in an exponential manner in the two key ar... more Organometal halide perovskite solar cells have evolved in an exponential manner in the two key areas of efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet was stability, which has been limiting practical application, but now the state of the art is promising, being measured in thousands of hours. These improvements have been achieved through the application of different materials, interfaces and device architecture optimizations, especially after the investigation of hole conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost and easy device fabrication methods. However, this work is still far from complete. There are various issues associated with the degradation of Omh-perovskite, and the interface and device instability which must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in stability and practical outdoor applications of Omh-PSCs. For successful small and large scale applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The causes of failure and associated mechanisms of device degradation, followed by the origins of degradation, approaches to improve stability, and methods and protocols are discussed in detail and form the main focus of this review article.
Uploads
Papers by Taame Abraha Berhe
efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet
was stability, which has been limiting practical application, but now the state of the art is promising, being
measured in thousands of hours. These improvements have been achieved through the application of
different materials, interfaces and device architecture optimizations, especially after the investigation of hole
conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost
and easy device fabrication methods. However, this work is still far from complete. There are various
issues associated with the degradation of Omh-perovskite, and the interface and device instability which
must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion
efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in
stability and practical outdoor applications of Omh-PSCs. For successful small and large scale
applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The
causes of failure and associated mechanisms of device degradation, followed by the origins of degradation,
approaches to improve stability, and methods and protocols are discussed in detail and form the main
focus of this review article.
efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet
was stability, which has been limiting practical application, but now the state of the art is promising, being
measured in thousands of hours. These improvements have been achieved through the application of
different materials, interfaces and device architecture optimizations, especially after the investigation of hole
conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost
and easy device fabrication methods. However, this work is still far from complete. There are various
issues associated with the degradation of Omh-perovskite, and the interface and device instability which
must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion
efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in
stability and practical outdoor applications of Omh-PSCs. For successful small and large scale
applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The
causes of failure and associated mechanisms of device degradation, followed by the origins of degradation,
approaches to improve stability, and methods and protocols are discussed in detail and form the main
focus of this review article.
efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet
was stability, which has been limiting practical application, but now the state of the art is promising, being
measured in thousands of hours. These improvements have been achieved through the application of
different materials, interfaces and device architecture optimizations, especially after the investigation of hole
conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost
and easy device fabrication methods. However, this work is still far from complete. There are various
issues associated with the degradation of Omh-perovskite, and the interface and device instability which
must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion
efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in
stability and practical outdoor applications of Omh-PSCs. For successful small and large scale
applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The
causes of failure and associated mechanisms of device degradation, followed by the origins of degradation,
approaches to improve stability, and methods and protocols are discussed in detail and form the main
focus of this review article.
efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet
was stability, which has been limiting practical application, but now the state of the art is promising, being
measured in thousands of hours. These improvements have been achieved through the application of
different materials, interfaces and device architecture optimizations, especially after the investigation of hole
conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost
and easy device fabrication methods. However, this work is still far from complete. There are various
issues associated with the degradation of Omh-perovskite, and the interface and device instability which
must be addressed to achieve good reproducibility and long lifetimes for Omh-PSCs with high conversion
efficiencies. A comprehensive understanding of these issues is required to achieve breakthroughs in
stability and practical outdoor applications of Omh-PSCs. For successful small and large scale
applications, besides the improvement of the PCE, the stability of Omh-PSCs has to be improved. The
causes of failure and associated mechanisms of device degradation, followed by the origins of degradation,
approaches to improve stability, and methods and protocols are discussed in detail and form the main
focus of this review article.