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Perovskite conversion efficiency of solar cell ...

Newstime:2016-04-11 12:09:19

In March 17, 2016, researchers at the Federal Institute of Technology (EPFL) in Lausanne, Switzerland, improved the photoelectric conversion efficiency of perovskite type photovoltaic devices to 21.1%, and the device had good repeatability and stability.

Perovskite Thin film photovoltaic cells have potential low cost advantages. However, the thermal stability of such batteries remains a major problem. Adding cesium metal (Cs) into the perovskite film component will help to improve the thermal and structural stability of the battery. Using this scheme, EPFL researchers have developed a perovskite thin film photovoltaic device with an efficiency of up to 21.1% and a very good device repeatability. The findings were published in the recent Energy and Environmental Science.

So far, lead based perovskite solar cell efficiency is the use of organic cationic hybrid (methyl ammonium (methylammonium (MA)) and formamidine cation (formamidinium (FA)) and mixed halogen (Br and I) preparation. Unfortunately, such perovskite based batteries based on MA/FA composite typically exhibit intrinsic structures and thermal instabilities. In addition, such perovskite films usually contain a small amount of impurity contamination and affect the crystal growth of perovskite films, so they tend to exhibit lower device performance, repeatability, and wider device efficiency. Adding a small amount of inorganic cesium cations to the perovskite film can form a purer and more stable three - element cation (Cs/MA/FA) - type perovskite structure. In addition, the composite films have good thermal stability, so the repeatability of the devices can be guaranteed. The results of the battery device show that the perovskite solar cell with the highest efficiency of 21.1% (stable output) and the average efficiency of more than 19% can be prepared by using such "three yuan cation" method. In addition, after 250 hours of work, the device also has more than 18% of the efficiency, showing a very good stability.

For details, please refer to the original:

Saliba M, Matsui T, Seo J-Y, Domanski K, Correa-Baena J-P, Nazeeruddin MK, Zakeeruddin SM, Tress W, Abate A, Hagfeldt A, Grätzel M. Cesium-containing Triple Cation Perovskite Solar Cells: Improved Stability, Reproducibility and High Efficiency.Energy and Environmental Science 16 March 2016. DOI: 10.1039/C5EE03874J

In addition, the device burn-in test conditions are as follows:

Aging under maximum power point tracking was carried out on masked devices which were mounted on a temperature controlled plate. The ageing was performed under nitrogen atmosphere and 1-sun equivalent illumination provided by an array of white LEDs. The devices were aged by means of keeping them under maximum load under illumination. The maximum power point was updated every 60 s by measuring the current response to a small perturbation in potential. Additionally, a full JV scan was taken every 15 min (at a scan rate of 100 mV s-1 starting from forward bias) which was used to extract the displayed parameters for the aging data.

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