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 modular airship system capable of assembling and disassembling two or more modular airships while in flight. The assembled modular airships providing improved lift and loft characteristics, while the disassembled modular airships provide for improved ground handling, storage, and transport. The modular airship comprises a coupling device to couple two or more modular airships together while in flight. The coupling device may include an electromagnetic attachment, a shaft and socket, Velcro, a latch, a draw cord, or a combination thereof. The modular airship may also have a propulsion system and the capability to carry a payload. The modular airship further comprises an electrical communication system which allows the two or more modular airships, when coupled together, to permit navigation, monitoring, and/or power systems to be shared and/or synchronized.

Abstract: A lighter-than-air gas handling method and system for an airship capable of operating at a plurality of altitudes each characterized by a plurality of environmental conditions comprises a structure including a first envelope and a flexible volume portion in fluid communication with the first envelope. The first envelope capable of containing a volume of lighter-than-air gas disposed within the first envelope at a pressure in substantial equilibrium with an ambient pressure external to the first envelope when the airship is operating at a first altitude of the plurality of altitudes. A lighter-than-air gas transfer mechanism is coupled with the first envelope and the flexible volume portion and operative to allow the lighter-than-air gas to flow into the flexible volume portion as the lighter-than-air gas expands when the airship ascends to a second altitude higher than the first altitude and before the expanded lighter-than-air gas exceeds the containment capability of the first envelope.

Abstract: A method and apparatus for controlling the flight direction of a blimp. The blimp includes an elongate fuselage for containing a lighter-than-air gas, a movable rudder located toward a tail end of the fuselage, and at least one propeller mounted on a side of the fuselage. The propeller is attached to the blimp by a connection that provides two axes of movement. The propeller connection can be rotated or pivoted (1) about a first axis which is a horizontal axis that is perpendicular to a direction of the longitudinal axis of the elongate fuselage, and/or (2) about a second axis which is a vertical axis that is perpendicular to the direction of the longitudinal axis of the fuselage.