Journal Article

Improving the light stability of perovskite solar cell with new hole transport material based on spirofluorene-9,9′-xanthene

Wang, Sijing, Luo, Huiming, Zhang, Zheng, Li, Bin, Guo, Kunpeng, Wang, Jiarong, Abdi-Jalebi, Mojtaba, Yuan, Ligang, Shi, Lei, Zhang, Wenjun, Ding, Liming, Yan, Keyou

2023

Overview

Development of suitable hole transport materials is vital for perovskite solar cells (PSCs) to diminish the energy barrier and minimize the potential loss. Here, a low-cost hole transport molecule named SFX-POCCF3 (23.72 $/g) is designed with a spiro[fluorene-9,9'-xanthene] (SFX) core and terminated by trifluoroethoxy units. Benefiting from the suitable energy level, high hole mobility, and better charge extraction and transport, the PSCs based on SFX-POCCF3 exhibit improved open-circuit voltage by 0.02 V, therefore, the PSC device based on SFX-POCCF3 exhibits a champion PCE of 21.48%, which is comparable with the control device of Spiro-OMeTAD (21.39%). More importantly, the SFX-POCCF3 based PSC possesses outstanding light stability, which retains 95% of the initial efficiency after about 1,000 h continuous light soaking, which is in accordance with the result continuous output at maximum power point. Whereas, Spiro-OMeTAD witnesses a rapid decrease to 80% of its original efficiency after 100 h light soaking. This work demonstrated that an efficient alignment of energy levels between HTL and perovskite will lead to significant highly efficient PSCs with remarkably enhanced light stability.

• Publisher: Springer Nature Singapore,Springer Nature B.V,Springer
• Subject: Climate Change / Control equipment / Deeper HOMO level / Efficiency / Energy / Energy levels / Environmental Science and Engineering / Fluorene / Hole mobility / Hole transport materials / Low cost / Maximum power / Open circuit voltage / Optical properties / Original Article / Perovskite solar cell / Perovskites / Photovoltaic cells / Solar cells / Stability / Xanthene