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RISS 인기검색어
- 검색키워드
- 저자 : Heiber, Michael C. (검색결과 2 건)
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Heiber, Michael C.,Okubo, Takashi,Ko, Seo-Jin,Luginbuhl, Benjamin R.,Ran, Niva A.,Wang, Ming,Wang, Hengbin,Uddin, Mohammad Afsar,Woo, Han Young,Bazan, Guillermo C.,Nguyen, Thuc-Quyen The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.10
<P>The rational design of new high performance materials for organic photovoltaic (OPV) applications is largely inhibited by a lack of design rules for materials that have slow bimolecular charge recombination. Due to the complex device physics present in OPVs, rigorous and reliable measurement techniques for charge transport and charge recombination are needed to construct improved physical models that can guide materials development and discovery. Here, we develop a new technique called impedance-photocurrent device analysis (IPDA) to quantitatively characterize the competition between charge extraction and charge recombination under steady state operational conditions. The measurements are performed on actual lab scale solar cells, have mild equipment requirements, and can be integrated into normal device fabrication and testing workflows. We perform IPDA tests on a broad set of devices with varying polymer:fullerene blend chemistry and processing conditions. Results from the IPDA technique exhibit significantly improved reliability and self-consistency compared to the open-circuit voltage decay technique (OCVD). IPDA measurements also reveal a significant negative electric field dependence of the bimolecular recombination coefficient in high fill factor devices, a finding which is inaccessible to most other common techniques and indicates that many of these techniques may overestimate the value that is most relevant for describing device performance. Future work utilizing IPDA to build structure-property relationships for bimolecular recombination will lead to enhanced design rules for creating efficient OPVs that are suitable for commercialization.</P>
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Peñuela Mauricio,Viáfara-Vega Ronald,Arias Leidy Laura,Cifuentes-Silva Héctor,López José,Cárdenas Heiber 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2
Usually is common to see great diferences among plants in our crops, this can allow us to think about selection of some plants with the best traits in order to show that character in the next generation and thus improve our crops. Nevertheless, we forget that the observed phenotypic variance of our crop is due to several factors as genetic and environmental components. Knowing how these factors afect traits is an important question because it can tell us whether a selection program is viable or not, which can save efort, time, and money. Here, we present a case of study in a Tabasco chili pepper crop from southwestern Colombia where farmers generally practice selection ignoring the genetic and environmental components of the selected traits. To reveal these components, we proposed to use the estimation of heritability in a narrow sense, for which we developed measurements in two generations of plants and we applied a simple regression model in concordance with the expected inbreeding value for an autogamous species. Subsequently, we amplifed microsatellite molecular markers to support heritability values based on genetic diversity and confrmed whether the assumed inbreeding value for their estimation based on the life history of the species, was correct.
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