TY - JOUR
T1 - Bifunctional hole-shuttle molecule for improved interfacial energy level alignment and defect passivation in perovskite solar cells
AU - You, Shuai
AU - Eickemeyer, Felix T.
AU - Gao, Jing
AU - Yum, Jun Ho
AU - Zheng, Xin
AU - Ren, Dan
AU - Xia, Meng
AU - Guo, Rui
AU - Rong, Yaoguang
AU - Zakeeruddin, Shaik M.
AU - Sivula, Kevin
AU - Tang, Jiang
AU - Shen, Zhongjin
AU - Li, Xiong
AU - Grätzel, Michael
N1 - Publisher Copyright:
© 2023, The Author(s).
PY - 2023/5
Y1 - 2023/5
N2 - Perovskite solar cells have reached a power conversion efficiency over 25%, and the engineering of the interface between the perovskite and hole transport layer (HTL) has been crucial to achieve high performance. Here we design a bifunctional molecule CBz-PAI with carbazole-triphenylamine and phenylammonium iodide units to passivate defects at the perovskite/HTL interface. Owing to a favourable energy level alignment with the perovskite, the CBz-PAI acts as a hole shuttle between the perovskite layer and the HTL. This minimizes the difference between the quasi-Fermi level splitting of the perovskite, or ‘internal’ Voc, and the external device Voc, thus reducing voltage losses. As a result, solar cells incorporating CBz-PAI reach a stabilized power conversion efficiency of 24.7% and maintain 92.3% of the initial efficiency after 1,000 h under damp heat test (85 °C and 85% relative humidity) and 94.6% after 1,100 h under maximum power point-tracking conditions.
AB - Perovskite solar cells have reached a power conversion efficiency over 25%, and the engineering of the interface between the perovskite and hole transport layer (HTL) has been crucial to achieve high performance. Here we design a bifunctional molecule CBz-PAI with carbazole-triphenylamine and phenylammonium iodide units to passivate defects at the perovskite/HTL interface. Owing to a favourable energy level alignment with the perovskite, the CBz-PAI acts as a hole shuttle between the perovskite layer and the HTL. This minimizes the difference between the quasi-Fermi level splitting of the perovskite, or ‘internal’ Voc, and the external device Voc, thus reducing voltage losses. As a result, solar cells incorporating CBz-PAI reach a stabilized power conversion efficiency of 24.7% and maintain 92.3% of the initial efficiency after 1,000 h under damp heat test (85 °C and 85% relative humidity) and 94.6% after 1,100 h under maximum power point-tracking conditions.
UR - https://www.scopus.com/pages/publications/85153115594
U2 - 10.1038/s41560-023-01249-0
DO - 10.1038/s41560-023-01249-0
M3 - 文章
AN - SCOPUS:85153115594
SN - 2058-7546
VL - 8
SP - 515
EP - 525
JO - Nature Energy
JF - Nature Energy
IS - 5
ER -
