Stabilizing halide perovskite surfaces for solar cell operation with wide-bandgap lead oxysalts

By Shuang Yang, Shangshang Chen, E. Mosconi, Yanjun Fang, Xun Xiao, Congcong Wang, Yu Zhou, Zhenhua Yu, Jingjing Zhao, Yongli Gao and 2 more. Science, 2019

804 citations recorded by the source corpus.

Stability through oxysalts The stability of organic-inorganic perovskite solar cells is limited by degradation from oxygen and water. Yang et al. show that in situ reaction of perovskites with sulfate or phosphate ions can create thin, strongly bonded lead oxysalt layers that protect defect sites. This layer also boosts charge carrier lifetimes that lead to a power conversion efficiency of more than 20%. Encapsulated devices maintained about 97% of this efficiency with simulated solar irradiation for nearly 2 months at a realistic operation temperature of 65°C. Science, this issue p. 473 Thin lead oxysalt layers passivate hybrid perovskite surfaces under an ambient atmosphere and enhance solar cell efficiency. We show that converting the surfaces of lead halide perovskite to water-insoluble lead (II) oxysalt through reaction with sulfate or phosphate ions can effectively stabilize the perovskite surface and bulk material. These capping lead oxysalt thin layers enhance the water resistance of the perovskite films by forming strong chemical bonds. The wide-bandgap lead oxysalt layers also reduce the defect density on the perovskite surfaces by passivating undercoordinated surface lead centers, which are defect-nucleating sites. Formation of the lead oxysalt layer increases the carrier recombination lifetime and boosts the efficiency of the solar cells to 21.1%. Encapsulated devices stabilized by the lead oxysalt layers maintain 96.8% of their initial efficiency after operation at maximum power point under simulated air mass (AM) 1.5 G irradiation for 1200 hours at 65°C.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/974a518928f496d47a77667b38344f9f6f513146

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. M. Graetzel
2. A. Hagfeldt
3. S. Stranks
4. Yang Yang
5. S. M. Zakeeruddin
6. Hui‐Seon Kim
7. N. Park
8. Jingjing Xue

In Polymers and Plastics

1. M. Graetzel
2. A. Hagfeldt
3. Yang Yang
4. S. Stranks
5. S. M. Zakeeruddin
6. M. Lira-Cantú
7. Hui‐Seon Kim
8. N. Park

Citations in the corpus

• Decoupling the effects of defects on efficiency and stability through phosphonates in stable halide perovskite solar cells (2021, background): “This result was unexpected because the application of additives in high-quality PSCs usually enhances both the efficiency and stability (as in Lin et al.,51 and Yang et al.52) , and the role of defects in these properties is often linked.”