Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 12, Pages 7826-7833Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00520
Keywords
solar cell; perovskite; zinc oxide; aluminum doping thermally stable
Funding
- China-Israel Scientific and Strategic Research Fund [2015DFG52690]
- Science and Technology Development Foundation of China Academy of Engineering Physics [2014A0302015]
- National Natural Science Foundation of China (NSFC) [51272126]
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Although low-temperature, solution-processed zinc oxide (ZnO) has been widely adopted as the electron collection layer (ECL) in perovskite solar cells (PS Cs) because of its simple synthesis and excellent electrical properties such as high charge mobility, the thermal stability of the perovskite films deposited atop ZnO layer remains as a major issue. Herein, we addressed this problem by employing aluminum-doped zinc oxide (AZO) as the ECL and obtained extraordinarily thermally stable perovskite layers. The improvement of the thermal stability was ascribed to diminish of the Lewis acid base chemical reaction between perovskite and ECL. Notably, the outstanding transmittance and conductivity also render AZO layer as an ideal candidate for transparent conductive electrodes, which enables a simplified cell structure featuring glass/AZO/perovskite/SpiroOMeTAD/Au. Optimization of the perovskite layer leads to an excellent and repeatable photovoltaic performance, with the champion cell exhibiting an open-circuit voltage (Voc) of 0.94 V, a short-circuit current (Lc) of 20.2 mA cm(-2), a fill factor (FF) of 0.67, and an overall power conversion efficiency (PCE) of 12.6% under standard 1 sun illumination. It was also revealed by steady-state and time-resolved photoluminescence that the AZO/perovskite interface resulted in less quenching than that between perovskite and hole transport
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