The goal of this work is aimed to improve the power conversion efficiency of single crystalline silicon-based photovoltaic （PV） cells by using the solar spectral conversion principle, which employed a down-convertin...The goal of this work is aimed to improve the power conversion efficiency of single crystalline silicon-based photovoltaic （PV） cells by using the solar spectral conversion principle, which employed a down-converting phosphor to convert a high-energy ultraviolet photon to the less energetic red-emitting photons to improve the spectral response of Si solar cells. In this study, the surface of silicon solar cells was coated with a red-emitting KCaGd（PO4）2：Eu3＋ phosphor by using the screen-printing technique. In addition to the investigation on the microstructure using scanning electron microscopy （SEM）, we measured the short circuit current （Isc）, open circuit voltage （Voc）, and power conversion efficiency （η） of spectral-conversion cells and compared with those of bare solar cells as a reference. Preliminary experimental results revealed that in an optimized PV cell, an enhancement of （0.64＋0.01）% （from 16.03% to 16.67%） in Δη of a Si-based PV cell was achieved.展开更多
土壤缺磷和低磷利用率是现代农业生产发展的主要限制因素之一,筛选和培育磷高效吸收利用品种是提高磷素利用率的有效途径.采用土壤盆栽试验方法进行了不同大豆(G ly cine m ax(L.)M err.)品种磷吸收利用特性比较研究.结果表明,在缺磷和...土壤缺磷和低磷利用率是现代农业生产发展的主要限制因素之一,筛选和培育磷高效吸收利用品种是提高磷素利用率的有效途径.采用土壤盆栽试验方法进行了不同大豆(G ly cine m ax(L.)M err.)品种磷吸收利用特性比较研究.结果表明,在缺磷和正常供磷条件下,不同大豆品种植株在株高、根干重、地上部干重、根冠比率、植株磷含量和其相对值、磷吸收量和其相对值、磷利用效率和其相对比值等方面表现出显著的差异,多数达到了极显著水平.相关分析表明,在缺磷条件下,大豆不同品种植株磷的利用效率及其相对比值与植株磷含量和磷吸收量以及它们的相对值呈显著或极显著负相关,植株磷含量与植株磷吸收量呈极显著正相关.以植株干物质量和其相对值、植株磷吸收量和其相对值以及植株磷利用效率为筛选指标,筛选出3个大豆磷高效品种.展开更多
基金Project supported by National Science Council of Taiwan (NSC98-2113-M-009-005-MY3)
文摘The goal of this work is aimed to improve the power conversion efficiency of single crystalline silicon-based photovoltaic （PV） cells by using the solar spectral conversion principle, which employed a down-converting phosphor to convert a high-energy ultraviolet photon to the less energetic red-emitting photons to improve the spectral response of Si solar cells. In this study, the surface of silicon solar cells was coated with a red-emitting KCaGd（PO4）2：Eu3＋ phosphor by using the screen-printing technique. In addition to the investigation on the microstructure using scanning electron microscopy （SEM）, we measured the short circuit current （Isc）, open circuit voltage （Voc）, and power conversion efficiency （η） of spectral-conversion cells and compared with those of bare solar cells as a reference. Preliminary experimental results revealed that in an optimized PV cell, an enhancement of （0.64＋0.01）% （from 16.03% to 16.67%） in Δη of a Si-based PV cell was achieved.
文摘土壤缺磷和低磷利用率是现代农业生产发展的主要限制因素之一,筛选和培育磷高效吸收利用品种是提高磷素利用率的有效途径.采用土壤盆栽试验方法进行了不同大豆(G ly cine m ax(L.)M err.)品种磷吸收利用特性比较研究.结果表明,在缺磷和正常供磷条件下,不同大豆品种植株在株高、根干重、地上部干重、根冠比率、植株磷含量和其相对值、磷吸收量和其相对值、磷利用效率和其相对比值等方面表现出显著的差异,多数达到了极显著水平.相关分析表明,在缺磷条件下,大豆不同品种植株磷的利用效率及其相对比值与植株磷含量和磷吸收量以及它们的相对值呈显著或极显著负相关,植株磷含量与植株磷吸收量呈极显著正相关.以植株干物质量和其相对值、植株磷吸收量和其相对值以及植株磷利用效率为筛选指标,筛选出3个大豆磷高效品种.
