Abstract: Disclosed herein are organic photosensitive devices including at least one exciton-blocking charge carrier filter. The filters comprise a mixture of at least one wide energy gap material and at least one electron or hole conducting material. As described herein, the novel filters simultaneously block excitons and conduct the desired charge carrier (electrons or holes).

Abstract: A coffee serving contains a composition of a combination of a preselected amount of a coffee bean selection in flaked or ground coffee particle size and a preselected amount of a fruit acid-sodium bi-carbonate foamer composition, intimately mixed together in a water porous film serving unit bag. The ground coffee composition is disposed and secured in a serving unit bag, and is brewed in a preselected volume of boiling water for a preselected time period. When the unit bag of coffee combination is initially disposed in the boiling water, the unit bag floats, due to the carbon dioxide gas formed and evolving in the wetted bag, the gas agitating the grounds. As the carbon dioxide gas finally disperses through the porous film wet bag, the bag sinks to the bottom of the container of hot coffee solution. The slightly acidified or neutral pH brewed coffee solution is now ready to drink.