Open AccessIodine‐Optimized Interface for Inorganic CsPbI 2 Br Perovskite Solar Cell to Attain High Stabilized Efficiency Exceeding 14%
Author(s) -
Zhang Jingru,
Jin Zhiwen,
Liang Lei,
Wang Haoran,
Bai Dongliang,
Bian Hui,
Wang Kang,
Wang Qian,
Yuan Ningyi,
Ding Jianning,
Liu Shengzhong Frank
Publication year - 2018
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201801123
Subject(s) - perovskite (structure) , heterojunction , materials science , energy conversion efficiency , solar cell , perovskite solar cell , iodine , quantum dot , optoelectronics , nanotechnology , chemical engineering , engineering , metallurgy
Recently, inorganic CsPbI 2 Br perovskite is attracting ever‐increasing attention for its outstanding optoelectronic properties and ambient phase stability. Here, an efficient CsPbI 2 Br perovskite solar cell (PSC) is developed by: 1) using a dimension‐grading heterojunction based on a quantum dots (QDs)/bulk film structure, and 2) post‐treatment of the CsPbI 2 Br QDs/film with organic iodine salt to form an ultrathin iodine‐ion–enriched perovskite layer on the top of the perovskite film. It is found that the above procedures generate proper band edge bending for improved carrier collection, resulting in effectively decreased recombination loss and improved hole extraction efficiency. Meanwhile, the organic capping layer from the iodine salt also surrounds the QDs and tunes the surface chemistry for further improved charge transport at the interface. As a result, the champion device achieves long‐term stabilized power conversion efficiency beyond 14%.