Perovskite solar cell taking tetraphenyl biphenyl diamine derivative as hole transport material

Abstract

The invention relates to a perovskite solar cell taking tetraphenyl biphenyl diamine derivative as a hole transport material. The battery adopts a p-i-n structure, and comprises ITO glass, a hole transport layer, a perovskite structure absorption layer, an electron transport layer and a back electrode, wherein the hole transport material adopted by the hole transport layer is a tetraphenyl benzidine derivative, four benzene rings on the periphery of the hole transport layer are functionalized by methoxy group and phosphonate, a firm chemical bond can be formed by the hole transport layer and ITO, and interface defects in contact with perovskite are effectively passivated. The battery is advantaged in that a high-quality perovskite film is prepared under the conditions of accurately controlling the water content and annealing in a specific atmosphere, so a perovskite solar cell device with excellent performance is obtained.

Description

technical field [0001] The invention relates to a perovskite solar cell using tetraphenylbenzidine diamine derivatives as hole transport materials, and belongs to the technical field of solar photovoltaic manufacturing. Background technique [0002] Since organic-inorganic hybrid halide perovskite materials were used in solar photovoltaic cells in 2009, their conversion efficiency has increased rapidly. At present, the small-area efficiency in the laboratory has exceeded 23%, showing a huge difference from conventional crystalline silicon and thin-film cells. Development potential. According to the sequence of receiving light, conventional perovskite cells are usually n-i-p structure, including TCO conductive substrate, electron transport layer, perovskite absorption layer, hole transport layer, back electrode, and there are some problems in n-i-p structure devices, such as The electron transport layer usually uses dense TiO2, and its preparation process requires high tempe...

AI Technical Summary

Problems solved by technology

According to the sequence of receiving light, conventional perovskite cells are usually n-i-p structure, including TCO conductive substrate, electron transport layer, perovskite absorption layer, hole transport layer, back electrode, and there are some problems in n-i-p structure devices, such as The electron transport layer usually uses dense TiO2, and its preparation process requires high temperature heating, which is not conducive to the preparation of flexible devices; the voltage and current of the device have a hysteresis phenomenon; the material of the hole transport layer is expensive and unstable, and the back electrode needs Au or Ag and other precious metals

Therefore, scientific and technical personnel have developed a p-i-n structure perovskite battery device, which sequentially includes a TCO conductive substrate, a hole transport layer, a perovskite absorption layer, an electron transport layer, and a back electrode. The transmission material usually chooses PEDOT:PSS or PTAA. However, PEDOT:PSS has certain hygroscopicity and acidity, which is not good for the stability of the device. PTAA is expensive, absorbs at short wavelengths of visible light, and is greatly affected by subsequent processes.

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