Date/Time: 04-04-2018 - Wednesday - 05:00 PM - 07:00 PM
Fei Han1 Lingling Wang1 Junsheng Luo1 Zhongquan Wan1 Jianxing Xia1 Chunyang Jia1

1, University of Electronics Science and Technology of China, Chengdu, , China

Methylammonium lead halide perovskites (MAPbX3) as promising light absorbers have great potential in perovskite solar cells (PSCs) due to notable characteristics of optimal band gaps, long-range exciton diffusion lengths, high ab-sorption coefficients and simple solution approaches. To date, the highest power conversion efficiency (PCE) of 22.1% has been achieved in a typically sandwiched device architecture. PSCs are still facing some challenges, such as the TiO2/MAPbI3 heterojunction interface loss, hysteresis behavior and reproducibility. Hence, we systematically studied the independent role of 2-, 3- and 4-pyridinesulfonic acid (PA) self-assembled monolayers (SAMs) on perovskite crys-tallinity and illuminated the binding energies of the above-mentioned SAMs on TiO2 and perovskite surfaces for highly efficient PSCs with reduced TiO2/MAPbI3 heterojunction interface loss, negligible hysteresis and high reproducibility. Through use of the 4-PA SAMs, the PSC exhibits striking improvements to the reach the highest efficiency of 18.90%, which constitutes an enhancement of ∼20% compared to that of PA SAMs-unmodified PSC (14.65%). Our work high-lights the importance of SAMs dipolar interactions and binding energies of SAMs on TiO2 and perovskite surfaces at electron transporting layer (ETL)/perovskite interfaces and paves the way for further optimizing the performances of PSCs.

Meeting Program

5:00 PM–7:00 PM Apr 4, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E