Tong Yue Binary solution strategy enables high-efficiency quasi-2D perovskite solar cells with excellent thermal stability

Guest talk
Tong Yue,School of Chemistry,Beihang,University (Beijing, China).

Title: Binary solution strategy enables high-efficiency quasi-2D perovskite
solar cells with excellent thermal stability

Abstract: Quasi-two-dimensional (2D) perovskites are highly promising
light-harvesting materials for commercialization of perovskite solar cells
(PSCs) owing to the excellent materials stability. However, the coexistence
of multiple *n*-value species in 2D perovskites often causes increased
complexities in crystallization that can negatively affect the eventual
photovoltaic performance. Herein, we present a binary solution based
strategy via introducing nontoxic and widely accessible CH3COOH (HAc) as a
co-solvent for preparing high-quality 2D perovskite films. Based on a 2D
perovskite model system, (AA)2MA4Pb5I16 (*n* = 5), we show that the
prenucleation and grain growth kinetics are appreciably modified with HAc,
which benefits from the strong electron-donating ability of HAc with the
key component of PbI2, leading to formation of favorable cluster aggregates
and resultant modulation of crystal growth. With the HAc-based method, the
devices yield a boosted photovoltaic efficiency of 18.55% with an
impressive photovoltage of 1.26 V. The champion cells exhibit a supreme
thermal stability, showing <3% efficiency degradation under continuous
thermal aging for 800 h.

To join the meeting you can use: Meeting-ID648 8127 7310

For the password please contact Anastasia Barabash