Abstract: Photovoltaic devices having contact layers are described herein. Devices, intermediate structures, and methods for making multilayer contacts for perovskite photovoltaic devices are provided. Embodiments include back contacts for N-I-P structures.

Abstract: Methods and compositions for forming perovskite hole transport layers for use in manufacturing photovoltaic devices are described. Embodiments include using a plurality of hole transport materials to produce high-performance HTL contacts to improve performance and stability.

Abstract: The present disclosure provides a combined type hand warmer, including a first hand warmer unit and a second hand warmer unit; a first connection part is arranged on the first hand warmer unit, and a second connection part is arranged on the second hand warmer unit; the first connection part is detachably connected to the second connection part such that the first hand warmer unit and the second hand warmer unit are combined into a whole; and when a user needs to warm two hands/multiple body parts, the first hand warmer unit can be separated from the second hand warmer unit, and the first hand warmer unit and the second hand warmer unit can be respectively used for warming the two hands/multiple body parts.

Abstract: The present disclosure discloses a drive circuit of an energy storage power supply and an energy storage power supply. The drive circuit of an energy storage power supply includes a charging control circuit, a first direct current output circuit, an alternating current output circuit and a main control circuit. The main control circuit can detect the load condition of the first direct current output circuit and the alternating current output circuit, and then the main control circuit controls the first direct current output circuit and the alternating current output circuit to be off. Thus, the problem of high power consumption when the alternating current output circuit and the first direct current output circuit in the energy storage power supply are in the no-load state is solved.

Abstract: The utility model discloses a hand warmer with detachable battery, which relates to the hand warmer field, and comprises a shell, wherein the outer side of the shell is provided with a hardware piece, the inner side of the shell is fixedly provided with a PCB motherboard, and the inner side of the shell is also provided with a detachable battery compartment; the bottom of the shell is provided with an opening structure, and a battery cover is clamped at the opening, and the battery cover can be detached from the opening; the outer side of the shell is also provided with silica gel, which is formed by splicing two plastic shells, and the silica gel is arranged outside the connecting seam of the shell. By arranging the battery cover, which can be directly detached from the shell, the utility model is convenient to replace the battery, and can be used for hand warmers all day.

Abstract: The present disclosure provides a fan. The fan includes a fan main body, a circuit board, and an operating element. The circuit board is provided with a stepless adjusting member. The operating element is connected to the stepless adjusting member. The fan main body includes a first motor electrically connected to the circuit board and a fan blade connected to the first motor. The circuit board adjusts power output to the first motor when the operating element rotates and operates the stepless adjusting member. So as to adjust a rotating speed of the first motor. In this way, the user can adjust a desired wind speed of the fan blade according to a need, which solves the problem that the wind speed of the existing fan cannot be freely adjusted and improves the operating performance and the user experience.

Abstract: The present disclosure provides a combined type hand warmer, including a first hand warmer unit and a second hand warmer unit; a first connection part is arranged on the first hand warmer unit, and a second connection part is arranged on the second hand warmer unit; the first connection part is detachably connected to the second connection part such that the first hand warmer unit and the second hand warmer unit are combined into a whole; and when a user needs to warm two hands/multiple body parts, the first hand warmer unit can be separated from the second hand warmer unit, and the first hand warmer unit and the second hand warmer unit can be respectively used for warming the two hands/multiple body parts.

Abstract: The present disclosure provides a combined type hand warmer, including a first hand warmer unit and a second hand warmer unit; a first connection part is arranged on the first hand warmer unit, and a second connection part is arranged on the second hand warmer unit; the first connection part is detachably connected to the second connection part such that the first hand warmer unit and the second hand warmer unit are combined into a whole; and when a user needs to warm two hands/multiple body parts, the first hand warmer unit can be separated from the second hand warmer unit, and the first hand warmer unit and the second hand warmer unit can be respectively used for warming the two hands/multiple body parts.

Abstract: The utility model discloses a hand warmer with detachable battery, which relates to the hand warmer field, and comprises a shell, wherein the outer side of the shell is provided with a hardware piece, the inner side of the shell is fixedly provided with a PCB motherboard, and the inner side of the shell is also provided with a detachable battery compartment; the bottom of the shell is provided with an opening structure, and a battery cover is clamped at the opening, and the battery cover can be detached from the opening; the outer side of the shell is also provided with silica gel, which is formed by splicing two plastic shells, and the silica gel is arranged outside the connecting seam of the shell. By arranging the battery cover, which can be directly detached from the shell, the utility model is convenient to replace the battery, and can be used for hand warmers all day.

Abstract: The present disclosure discloses a drive circuit of an energy storage power supply and an energy storage power supply. The drive circuit of an energy storage power supply includes a charging control circuit, a first direct current output circuit, an alternating current output circuit and a main control circuit. The main control circuit can detect the load condition of the first direct current output circuit and the alternating current output circuit, and then the main control circuit controls the first direct current output circuit and the alternating current output circuit to be off. Thus, the problem of high power consumption when the alternating current output circuit and the first direct current output circuit in the energy storage power supply are in the no-load state is solved.

Abstract: The present disclosure provides an energy storage power supply, including a power supply main body and a strap, wherein the power supply main body is provided with a handle; a hanging part is arranged at the handle; the strap is detachably connected to the hanging part, so that a user can carry the energy storage power supply with the handle, and can also easily carry the energy storage power supply with the strap.