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Enhancing the Humidity Stability of Perovskite Films through Interfacial Modification with Differentiated Hydrophilic
Rui Wang1,2, Xudong Yang1,2, Qiaoyun Chen1
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
ACS Applied Materials & Interfaces
|August 20, 2024
Summary
Selecting appropriate water adsorbents like sorbitol for perovskite solar cells (Pero-SCs) enhances stability and efficiency. Moderate water adsorption is key for durable, high-performing Pero-SCs, mitigating degradation from moisture.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (Pero-SCs) require high-quality films for efficiency and stability.
- Water is a critical factor that degrades Pero-SC performance and longevity.
- Interface engineering is crucial for protecting perovskite layers from environmental stressors.
Purpose of the Study:
- To investigate the use of water adsorbents as protective interface layers in Pero-SCs.
- To evaluate the impact of different adsorbents (chitosan, sorbitol, sodium hyaluronate) on device performance and stability.
- To determine the optimal water adsorption capability for enhancing Pero-SC durability.
Main Methods:
- Modification of the perovskite upper interface with chitosan, sorbitol, and sodium hyaluronate (NaHA).
- Passivation of perovskite surface defects using the functional groups (-OH, -COOH) of the adsorbents.
- Testing of modified Pero-SCs under varying humidity levels (25% RH and 75% RH) for 800 hours.
- Analysis of power conversion efficiency (PCE) and device stability.
Main Results:
- Sodium hyaluronate (NaHA) modification yielded the highest initial PCE (21.74%).
- Sorbitol-modified devices demonstrated superior long-term stability, maintaining 80% PCE at low humidity and 64% at high humidity.
- NaHA-modified devices showed reduced stability, especially under high humidity (23% PCE retention).
Conclusions:
- Interface modification with water adsorbents can protect perovskite films from water erosion.
- Sorbitol offers a balanced water adsorption capability, leading to enhanced stability and good efficiency in Pero-SCs.
- Careful selection of adsorbents with moderate water absorption is vital for developing stable and efficient inverted Pero-SCs.
