Two quasi-interfacial p-n junctions observed by a dual-irradiation system in perovskite solar cells  

作　　者：Mohamed I.Omer Tao Ye Xianqiang Li Shaoyang Ma Dan Wu Lei Wei Xiaohong Tang Seeram Ramakrishna Qiang Zhu Shanxing Xiong Jianwei Xu Chellappan Vijila Xizu Wang 

机构地区：[1]Institute of Materials Research and Engineering(IMRE),Agency for Science,Technology and Research(A*STAR),#08-03,2 Fusionopolis Way,Innovis,Singapore 138634,Singapore [2]School of Electrical and Electronic Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,Singapore [3]Key laboratory of Micro/Nano Systems of Aerospace,Ministry of Education,Northwestern Polytechnical University,Xi’an 710072,China [4]Department of Mechanical Engineering,National University of Singapore,Singapore 117576,Singapore [5]College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,PR China [6]Department of Chemistry,National University of Singapore,3 Science Drive 3,Singapore 117543,Singapore [7]Institute of Sustainability for Chemicals,Energy and Environment(ISCE2),1 Pesek Road,Jurong Island,Singapore 627833,Singapore

出　　处：《npj Flexible Electronics》2023年第1期330-338,共9页npj-柔性电子（英文）

基　　金：supported by the Agriculture Program of the A*STAR(grant no.:A19D9a0096).

摘　　要：In general,perovskite solar cells(PSC)with a sensitized or thin-film architecture absorb light from a single-side illumination,and carrier separation and transport only take place inside the active layer of the perovskite film.Herein,we demonstrated a dualirradiation PSC system in which light passes through both the fluorinated tin oxide(FTO)side and the Au electrode side,resulting in much faster interfacial charge carrier extraction and transportation than that in a single-irradiation system,in which light passes through from either the FTO or semitransparent Au electrode side.This dual-irradiation PSC system with a configuration of FTO/Cl-TiO_(2)/Mp-TiO_(2)/mixed perovskite/spiro-OMeTAD/Au/ITO can form two quasi-interfacial p-n junctions,which occur separately at the interfaces of TiO_(2)/perovskite and perovskite/spiro-OMeTAD.When the PSC device was illuminated simultaneously from both the FTO and Au/ITO sides,the PSC achieved a total power conversion efficiency(PCE)as high as 20.1%under high light intensity(1.4 sun),which is higher than PCE(18.4%)of a single-irradiation system.The time of flight(TOF)photoconductivity,small perturbation transient photovoltaic(TPV),finite-difference time-domain(FDTD)optical simulations,and dual illumination-sidedependent impedance spectroscopy(ISD-IS)were used to authenticate the presence of two quasi-interfacial p-n junctions in the PSC,creating more charge carriers than only one quasi p-n junction,and thus leading to a fast recombination process.

关 键 词：process. PEROVSKITE INTERFACIAL 

分 类 号：O61[理学—无机化学]