期刊
ORGANIC ELECTRONICS
卷 42, 期 -, 页码 228-233出版社
ELSEVIER
DOI: 10.1016/j.orgel.2016.12.047
关键词
Perovskites; Photoluminescence; Time-resolved emission spectra; Exciton-like transitions; Defect-mediated recombination
资金
- National Science Foundation [1428298, 1547771]
- Direct For Education and Human Resources
- Division Of Human Resource Development [1547771] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [GRANTS:13677091] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1428298] Funding Source: National Science Foundation
Even though perovskite based solar cells have been routinely fabricated with preheated perovskite solutions, currently the underlying mechanism of how the perovskite precursor solution temperature influences perovskite solar cells has not been studied yet. Therefore, we investigated the impacts of perovskite solution temperatures on charge carrier dynamics of perovskite film and perovskite solar cell performance that were quantitatively analyzed using steady-state photoluminescence (PL), time resolved emission spectra (TRES), excitation-dependence of PL and current-voltage measurements. It is found that the perovskite solution temperature greatly influenced the morphologies, defect densities and states, and charge recombination dynamics of perovskite thin films. Particularly, steady-state and time-resoled PL measurements revealed that perovskite thin films prepared with the perovskite solution temperature around 70 degrees C produced lowest surface and bulk defect densities. In addition, it is found that the perovskite solution temperature around 70 degrees C led to exciton-like transitions while lower and higher solution temperatures led to defect-mediated recombination of perovskite thin films. Such recombination dynamics of perovskite films strongly influenced the light absorption and extraction efficiencies of photogenerated charge carriers which in turn influenced short-circuit current, fill factor, and open circuit voltage of perovskite solar cells. As a result, better photovoltaic performance of perovskite solar cells was observed when prepared with the precursor temperature around 70 degrees C. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据