Solar battery

Abstract

The invention discloses a solar battery comprising a first electrode, a first photosensitive layer, a second photosensitive layer, a second electrode and a lower conversion layer, which are sequentially arranged from the bottom up. The first photosensitive layer and the second photosensitive layer form an electron donor-electron acceptor heterojunction. The solar battery disclosed by the invention has high utilization ratio of a solar spectrum, the problem of the thermal effect of current carriers is overcome, and the energy conversion efficiency of the solar battery is largely increased.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a device for converting light energy into electrical energy, and more specifically to a solar cell. Background technique [0002] With the continuous consumption of fossil fuels and the increasingly serious environmental pollution, people's demand for the development of renewable energy is becoming increasingly urgent. As a typical renewable energy, solar energy is considered to be the green energy with the most application prospects and application value due to its advantages such as non-pollution and convenient source. According to statistics, the energy transferred by the sun's radiation to the earth for one day is enough to allow more than 6 billion inhabitants on the earth to use it for 27 years at the current growth rate of energy consumption. Solar cells, when exposed to sunlight, convert light energy directly into electricity without mechanical rotation or polluting by-p...

AI Technical Summary

Problems solved by technology

In the past two decades, solid-state organic solar cells have made remarkable progress, but their efficiency still cannot meet the requirements of large-scale industrialization. Therefore, how to improve the energy conversion efficiency of organic solar cells has become a problem that affects their wide application.

[0004] For organic small molecule solar cells, there are many factors that affect their energy conversion efficiency. One of the more prominent reasons is that organic small molecule materials have low utilization of the solar spectrum, and their absorption of sunlight is mainly concentrated in the visible light region (wavelength Range 380nm-780nm), less absorption to ultraviolet light (wavelength range <380nm); moreover, the absorption of high-energy photons by organic small molecule materials will produce a thermal effect of carriers, which has a significant impact on the performance of organic small molecule solar cell devices A large adverse effect is also a factor limiting its energy conversion efficiency

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