Enhancement of Perovskite Solar Cells Efficiency using N-Doped TiO(2) Nanorod Arrays as Electron Transfer Layer.
Enhancement of Perovskite Solar Cells Efficiency using N-Doped TiO(2) Nanorod Arrays as Electron Transfer Layer.
复制标题
DOI：
10.1186/s11671-016-1811-0
复制
发表时间：
2017-12
影响因子：
--
通讯作者：
Mao YL
中科院分区：
文献类型：
--
作者：
Zhang ZL;Li JF;Wang XL;Qin JQ;Shi WJ;Liu YF;Gao HP;Mao YL
本文采用水热法合成了n掺杂TiO2 （N-TiO2）纳米棒阵列，并以其作为电子传递层制备了钙钛矿太阳能电池。通过改变N掺杂量来优化太阳能电池的性能。N掺杂量为1% （N/Ti，原子比）的N-TiO2太阳能电池的功率转换效率达到11.1%，比未掺杂的N-TiO2太阳能电池的功率转换效率提高14.7%。为了深入了解改进情况，进行了一些调查。采用x射线粉末衍射（XRD）和扫描电子显微镜（SEM）对结构进行了表征。能谱仪（EDS）和Tauc图显示TiO2纳米棒中掺杂了N。吸收光谱显示，N-TiO2对可见光的吸收高于未掺杂TiO2。N掺杂使带隙从3.03 eV减小到2.74 eV。光致发光（PL）和时间分辨光致发光（TRPL）光谱显示，电子从钙钛矿层向N-TiO2的转移速度比未掺杂TiO2快。电化学阻抗谱（EIS）表明，N-TiO2基器件的电阻小于未掺杂TiO2基器件。本文的在线版本（doi:10.1186/s11671-016-1811-0）包含补充材料，可供授权用户使用。
In this paper, N-doped TiO2 (N-TiO2) nanorod arrays were synthesized with hydrothermal method, and perovskite solar cells were fabricated using them as electron transfer layer. The solar cell performance was optimized by changing the N doping contents. The power conversion efficiency of solar cells based on N-TiO2 with the N doping content of 1% (N/Ti, atomic ratio) has been achieved 11.1%, which was 14.7% higher than that of solar cells based on un-doped TiO2. To get an insight into the improvement, some investigations were performed. The structure was examined with X-ray powder diffraction (XRD), and morphology was examined by scanning electron microscopy (SEM). Energy dispersive spectrometer (EDS) and Tauc plot spectra indicated the incorporation of N in TiO2 nanorods. Absorption spectra showed higher absorption of visible light for N-TiO2 than un-doped TiO2. The N doping reduced the energy band gap from 3.03 to 2.74 eV. The photoluminescence (PL) and time-resolved photoluminescence (TRPL) spectra displayed the faster electron transfer from perovskite layer to N-TiO2 than to un-doped TiO2. Electrochemical impedance spectroscopy (EIS) showed the smaller resistance of device based on N-TiO2 than that on un-doped TiO2. The online version of this article (doi:10.1186/s11671-016-1811-0) contains supplementary material, which is available to authorized users.