Exploring the Charge Dynamics and Energy Loss in Printable Mesoscopic Perovskite Solar Cells

Cheng Qiu; Xia Lin; Yixiao WangGuanqun FengChenxi LingJiale LiuJiankang DuXufeng XiaoXi WangPeng ZengMingzhen LiuWenxi LiangYue HuHongwei Han

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Exploring the Charge Dynamics and Energy Loss in Printable Mesoscopic Perovskite Solar Cells

机译：Exploring the Charge Dynamics and Energy Loss in Printable Mesoscopic Perovskite Solar Cells

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Printable mesoscopic perovskite solar cells (p-MPSCs) show great potentialfor commercialization, but little research has been devoted to understandingthe dynamics of photogenerated carriers in this type of cell, limiting theirfurther performance improvements. Herein, two techniques with complementarytime scales were used, namely transient absorption spectroscopy(TAS) and time-resolved photoluminescence spectroscopy (TRPL), to quantifythe processes of carrier recombination, diffusion, and extraction in p-MPSCs.It is found that the carrier diffusion in mesoscopic samples should not beneglected at the time scale monitored by TRPL, and thus the diffusionrecombinationmodel is more suitable compared to the simplified carrierrecombination model usually used in interpreting the data of TAS and TRPL.As a result, the calculated carrier diffusion length within the perovskite filledin the mesoscopic scaffold is up to 5.48 μm. This also demonstrates that thehole transport layer is not necessary for p-MPSCs. In addition, the relationshipbetween the maximum quasi-Fermi energy level splitting and the bulkrecombination coefficient within perovskite is determined through calculations.This study takes an important step toward establishing the relationshipbetween the mesoscopic structure, carrier dynamics, and device performanceof p-MPSCs.

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来源
《Advanced energy materials》 |2022年第47期|2202813.1-2202813.10|共10页
作者
Cheng Qiu; Xia Lin; Yixiao WangGuanqun FengChenxi LingJiale LiuJiankang DuXufeng XiaoXi WangPeng ZengMingzhen LiuWenxi LiangYue HuHongwei Han;
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作者单位

Michael Graetzel Center for Mesoscopic Solar CellsWuhan National Laboratory for OptoelectronicsKey Laboratory of Materials Chemistry for Energy Conversion andStorage of Ministry of EducationHuazhong University of Science and TechnologyWuhan, Hubei 430074,;

School of Materials and Energy and Center for Applied ChemistryUniversity of Electronic Science and TechnologyChengdu 611731, P. R. China;

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diffusion lengths; dynamics; perovskite solar cells; time-resolvedphotoluminescence spectroscopy; transient absorption spectroscopy;

Exploring the Charge Dynamics and Energy Loss in Printable Mesoscopic Perovskite Solar Cells

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