SKKU Research Stories (prof. Hyun Jung Shin of DOES)
- 성균융합원
- Hit2801
- 2018-06-18
Significantly improved stability of perovskite solar cells
Prof. Hyun Jung Shin and prof. Nam Gyu Park have jointly announced that they have succeeded in developing technologies to dramatically improve the stability of the perovskite solar cell, which is widely regarded as the next generation solar cell material. Perovskite is the name of a crystal structure and refers to a group of materials of special composition using the organic-inorganic halide elements as the latest generation solar cells. Perovskite solar cells are a high efficiency visible light absorbing layer with a light conversion efficiency exceeding 22% for a short period of research and are of great interest to many researchers worldwide. Last year, Professor Park Nam Gyu was nominated winner of the Nobel Prize in Chemistry for his pioneering work in solar cell research. This material has very good photoelectric properties and at the same time it has the advantage of low cost, but it is pointed out as a hindrance to industrialization because of its short life span due to moisture, heat and light.
The structure of the perovskite solar cell used in this study is an inverted type pin structure and the charge transport layer, which is another material constituting the perovskite solar cell, is composed of an inorganic material, We implemented a skate solar cell. All of the charge transport layers were deposited by atomic layer deposition (ALD) and formed uniform and dense films without pinholes in the films. In particular, ZnO doped with Al (AZO) was adopted as an inorganic electron transporting layer, and this material protected not only the excellent electron transporting property but also the underlying perovskite layer. It has been found that ALD - AZO improves stability by preventing penetration of external moisture and oxygen into the perovskite layer and evaporation of volatile components of perovskite. Especially, the characteristics of ALD - AZO layer between electrodes / perovskite are different from those of existing encapsulation technology on the surface of finished device, which prevents interdiffusion between electrodes / perovskite The stability of the operating environment of the solar cell has been drastically improved.
In the evaluation of the stability of perovskite solar cells, the devices that have not adopted the ADL-AZO thin film proceeded to deteriorate the device at a very high speed when irradiated with light, while the device with the ALD-AZO thin film had 500 hours And 99.5% of initial efficiency, respectively. This stable perovskite solar cell starts at an initial efficiency of 18.45%, and is maintained at a high temperature (85 ° C) and ambient air atmosphere, in an extreme environment of simulated solar (1-sun) % Efficiency, which greatly enhanced the industrialization potential of perovskite solar cells.
This research was carried out by Professor Shin Hyun-jung, Seosung Researcher, and Chemical Engineering Professor Park Nam-gyu with the support of the Korea Research Foundation and the Global Frontier Project (Director: Prof. Choi Man-soo). In the material science field, Advanced Materials Published in the May 23 online edition of Advanced Materials (IF 19.791).