11% Efficient Perovskite Solar Cell Based on ZnO Nanorods: An Effective Charge Collection System

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• 作者：Dae-Yong Son ; Jeong-Hyeok Im ; Hui-Seon Kim ; Nam-Gyu Park
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：16567-16573
• 全文大小：538K
• ISSN：1932-7455

文摘

A perovskite solar cell based on ZnO nanorods was prepared, and its photovoltaic performance was investigated. ZnO nanorods were grown on the ZnO seed layer from solution, and their diameters and lengths were controlled by precursor concentration and growth time. CH₃NH₃PbI₃ perovskite infiltrated ZnO nanorods showed a power conversion efficiency of 11.13% with short-circuit current density J_sc of 20.08 mA/cm², open-circuit voltage V_oc of 991 mV and fill factor of 0.56. Square spectral feature of external quantum efficiency (EQE) was observed, where EQE exceeded 80% in almost the entire wavelength range from 400 to 750 nm, and the integrated current density of 20.03 mA/cm² calculated from EQE data was in good agreement with the observed J_sc. Compared to the perfect spectral response of ZnO nanorods, a perovskite solar cell based on TiO₂ nanorods exhibited an integrated current density (16 mA/cm²) much lower than the measured J_sc (20.9 mA/cm²). In addition, time-limited photocurrent response under 530 and 700 nm monochromatic beams at 10 Hz showed that device signal amplitude, associated with charge collection, was rapidly saturated for the ZnO nanorod-based device whereas charge collection was not fully detected for the TiO₂ nanorod-based device because of slow collection rate. The current results suggest that ZnO nanorod is an effective charge collection system in CH₃NH₃PbI₃ based perovskite solar cells.