Highly Efficient and Stable Perovskite Solar Cells via MultiFunctional Curcumin Modified Buried Interface

TL;DR

This paper introduces a curcumin-based interface modification that significantly improves efficiency and stability in perovskite solar cells by passivating defects and optimizing energy alignment.

Contribution

It presents a novel, green molecular modification method using curcumin to enhance interface quality and device performance in perovskite solar cells.

Findings

Achieved a PCE of 24.46% with curcumin modification.

Reduced interface defect density and improved energy level alignment.

Enhanced device stability and carrier transport.

Abstract

The buried interface between the electron transport layer and the perovskite layer suffers from severe interface defects and imperfect energy level alignment. To address this issue, this study employs a multifunctional organic molecule, curcumin, to modify the interface between SnO2 and the perovskite layer. The functional groups on curcumin effectively passivate the defects on both sides of the interface, reducing -OH and oxygen vacancy defects on the SnO2 surface and passivating uncoordinated Pb2+ in the perovskite layer. This results in a more compatible energy level alignment and lower defect density at the interface, enhancing carrier transport across it. Consequently, the devices based on curcumin achieve an impressive champion power conversion efficiency (PCE) of 24.46%, compared to 22.03% for control devices. This work demonstrates a simple, green, hydrophobic, and efficient molecular modification method for the buried interface, laying the foundation for the development of high-performance and stable perovskite solar cells.