Directional administration of interface defects achieved in perovskite solar cells

Organic-inorganic halide perovskite supplies have glorious optical seize capability and service conductivity. Perovskite solar cells, with superb energy conversion effectivity, present nice software prospects. However, numerous unfavorable defects, rising up after or throughout annealing course of resulting from their ionic nature, would result in websites of nonradiative recombination and speed up degradation of gadget effectivity and stability.

A analysis group lead by Pan Xu from the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences (CAS), cooperating with Zheng Haiying from Anhui University, have achieved high-efficiency perovskite solar cells by passivating interface defects utilizing new-type low-dimensional perovskite. Related work has been revealed in ACS Energy Letters.

The researchers passivated and stabilized the perovskite gentle absorbing layer with amphoteric heterocyclic cation, and designed a new-type low-dimensional perovskite passivation layer.

They discovered that the brand new perovskite, resulting from its amphoteric properties and powerful molecular interplay, was capable of cope with completely different surface-terminating ends and exhibited a wide range of passivation results.

According to the theoretical calculation of defect formation power, the formation of lead-based defect was successfully inhibited. The modified perovskite solar cells displayed lowered defect density and lowered nonradiative recombination, thereby leading to a power conversion efficiency of over 24%. In addition, the long-term stability towards humidity, excessive temperature and lightweight was improved.