摘要
SnO_(2)具有光稳定性优异、可低温溶液制备等优点被视为电子传输层的优异材料之一,广泛应用于高效稳定的平面异质结钙钛矿太阳能电池.本文在低温(150℃)下采用旋涂工艺制备SnO_(2)电子传输层,探究了SnO_(2)前驱体溶液不同浓度(SnO_(2)质量分数为2.5%—10.0%)下制备的SnO_(2)电子传输层对钙钛矿太阳能电池性能的影响.通过对SnO_(2)薄膜进行扫描电子显微镜(SEM)、紫外-可见光(UV-Vis)吸收光谱和透射光谱分析,发现基底的覆盖率、透光率和SnO_(2)薄膜的带隙随SnO_(2)前驱液浓度的增加而增大;通过对SnO_(2)/钙钛矿(MAPbI_(3))薄膜进行SEM、UV-Vis、X-射线衍射(XRD)、稳态光致发光(PL)光谱分析,发现SnO_(2)胶体分散液浓度为7.5%制备的SnO_(2)层上沉积的MAPbI_(3)的粒径最大,结晶度最好,具有更有效的电荷提取和传输能力;通过对钙钛矿太阳能电池进行电化学交流阻抗(EIS)、外量子效率(EQE)分析,发现质量分数为7.5%制备的器件具有最小的传输电阻和最佳的光电转换能力,且获得了15.82%的光电转换效率,在环境空气湿度(25±5)℃,RH>70%,无封装的条件下储存600 h后仍保持初始效率的92%.同时,采用浓度优化后的SnO_(2)前驱液制备了柔性器件,获得了13.12%的光电转换效率,且在(30±5)℃,RH>70%的空气环境下储存84天后仍保持初始效率的48%,在弯曲循环1000次(弯曲半径为3 mm)后,仍保留了初始效率的78%.这为提高柔性钙钛矿太阳能电池性能奠定了基础.
SnO_(2) has the advantages of excellent photostability and can be prepared at low-temperature below 200℃.It is regarded as one of the excellent materials for the electron transport layer,and widely used in efficient and stable planar heterojunction perovskite solar cells.In this work,the low-cost,dense and uniform SnO_(2) electron transport layer is prepared by spin coating at low temperature(150℃)for perovskite solar cells with a structure of FTO/SnO_(2)/CH_(3)NH_(3)PbI_(3)(MAPbI_(3))/Spiro-OMeTAD/Au.The crystallization and photoelectric properties of SnO_(2) electron transport layers prepared at different concentrations(2.5%-10%)at 150℃,and the influences of SnO_(2) electron transport layers on the formation of perovskite films and the performances of perovskite solar cells are discussed.By analyzing the scanning electron microscope(SEM),ultraviolet-visible light absorption spectrum(UV-Vis)and transmission spectrum of the SnO_(2) film,it is found that the coverage and light transmittance of the substrate and band gap of the SnO_(2) film increase as the SnO_(2) content increases,while the absorbance decreases.By analyzing the SEM,UV-Vis,X-ray diffraction(XRD)and steady-state photoluminescence spectrum(PL)analysis of the SnO_(2)/MAPbI_(3) thin film,it is found that the MAPbI_(3) deposited on the SnO_(2) layer with a concentration of 7.5%is uniform and pinhole-free,has the largest particle size and the best crystallinity,as well as more effective charge extraction capability and transport capability.By analyzing the electrochemical impedance(EIS)and external quantum efficiency(EQE)of the device,the SnO_(2) electron transport layer with a concentration of 7.5%has better interface contact and lower interface resistance,which is beneficial to reducing the recombination of carriers and improving the photoelectric conversion capability,The perovskite solar cells based on SnO_(2) layer prepared with a concentration of 7.5%reaches a photoelectric conversion efficiency of 15.82%(V_(oc)=1.06 V,J_(sc)=21.62 mA/cm^(2),
作者
罗媛
朱从潭
马书鹏
朱刘
郭学益
杨英
Luo Yuan;Zhu Cong-Tan;Ma Shu-Peng;Zhu Liu;Guo Xue-Yi;Yang Ying(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Hunan Key Laboratory of Nonferrous Metal Resources Recycling,Central South University,Changsha 410083,China;National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling,Central South University,Changsha 410083,China;Guangdong Provincial Enterprise Key Laboratory of High Performance Thin Film Solar Materials,Qingyuan 511517,China;First Materials Co.,Ltd,Qingyuan 511517,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第11期390-400,共11页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61774169)
清远市创新创业团队项目(批准号:2018001)
广东省科技计划(批准号:2018B030323010)
中南大学研究生自主探索创新项目(批准号:2021zzts0612)资助的课题。
