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Science News: 2022 Small, How to Improve the Interface Stability of Inverted Triple-Cation Perovskite Solar Cells?

  The researchers published a study in Small in 2022. At present, perovskite solar cells can be roughly divided into two categories: upright (n-i-p) structure and inverted (p-i-n) structure. Inverted perovskite solar cells (PSCs) are known for their excellent device stability, simple structure, and low-temperature processing. However, disordered crystallization and bottom interface instability of perovskite films based on nickel oxide (NiOx) substrates are still the main factors affecting the power conversion efficiency (PCE) of PSCs.

  In this study, 2D perovskite with thiomorpholine 1,1-dioxide lead iodide (Td2PbI4) is introduced as a template to prepare 3D perovskite films with high crystal orientation and large grain size by a bottom-up growth method. By adding TdCl to the precursor solution, pre-crystallized 2D Td2PbI4 seeds can accumulate at the bottom interface, reducing the barrier to nucleation and providing a template for the growth of 3D perovskite films. Better (100) orientation and fewer defects during crystallization. In addition, the 2D Td2PbI4 on the bottom interface also hinders the redox reaction of the interface, reducing the hole extraction barrier on the buried interface. The results of the study found:

  1. Td-0.5 PSC achieves 22.09% PCE and 1.16V open-circuit voltage.
  2. In addition, the Td-0.5 PSC show extremely high stability, maintaining 84% of its initial PCE after 500 h of continuous irradiation under maximum power point operating conditions in N2 atmosphere.

  This work paves the way for improving the performance of inverted PSCs on NiOx substrate.

Td-0.5 PSC achieves 22.09% PCE and 1.16V open-circuit voltage

Td-0.5 PSC achieves 22.09% PCE and 1.16V open-circuit voltage.

Td-0.5 PSC JV EQE PCE
J–V curves of perovskite films with TdCl treatment at different molar concentration under AM 1.5G 100 mW cm2 illumination

J–V curves of perovskite films with TdCl treatment at different molar concentration under AM 1.5G 100 mW cm2 illumination.

Key Word: Inverted-structure perovskite solar cell, crystallization, precursor solution

Article link: https://doi.org/10.1002/smll.202203886

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Bottom-Up Templated and Oriented Crystallization

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