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首页> 外文期刊>RSC Advances >Highly crystalline Nb-doped TiO2 nanospindles as superior electron transporting materials for high-performance planar structured perovskite solar cells
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Highly crystalline Nb-doped TiO2 nanospindles as superior electron transporting materials for high-performance planar structured perovskite solar cells

机译：高结晶Nb掺杂的TiO2纳米锭是高性能平面结构钙钛矿太阳能电池的优良电子传输材料

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摘要

Planar-structured perovskite solar cells (PSCs) have received tremendous attention due to their high power conversion efficiency (PCE), simple process and low-cost fabrication. A compact thin film of electron transport materials (ETMs) plays a key role in these PSCs. However, the traditional ETMs of PSCs, TiO _(2) nanoparticulate films, suffer from low conductivity and high trap state density. Herein, we exploited TiO _(2) nanospindles as a compact ETM in planar PSCs for the first time, and achieved an efficient device with a PCE of 19.1%. By optimization with Nb doping into the TiO _(2) nanospindles, the PCE of the PSC was further improved up to 20.8%. The carrier transfer and collection efficiency were significantly improved after Nb ~(5+) doping, revealed by Mott–Schottky (MS) analysis, space charge limited current (SCLC), photoluminence (PL), time-resolved photoluminence (TRPL) spectra, electrochemical impedance spectra (EIS) and so forth. Moreover, the hysteresis behavior was effectively inhibited and the stability was significantly enhanced. This work may provide a new avenue towards the rational design of efficient ETMs for perovskite solar cells.
机译：平面结构的钙钛矿太阳能电池（PSC）由于其高功率转换效率（PCE），简单的工艺和低成本的制造而备受关注。在这些PSC中，致密的电子传输材料（ETM）薄膜起着关键作用。但是，传统的PSC ETMs TiO_（2）纳米颗粒薄膜的电导率低且陷阱态密度高。在本文中，我们首次将TiO_（2）纳米纺锤体用作平面PSC中的紧凑型ETM，并实现了PCE为19.1％的高效器件。通过优化Nb掺杂到TiO _（2）纳米锭中，PSC的PCE进一步提高了20.8％。掺杂Nb〜（5+）后，载流子转移和收集效率得到了显着提高，这通过Mott–Schottky（MS）分析，空间电荷限制电流（SCLC），光致发光（PL），时间分辨光致发光（TRPL）光谱得以揭示电化学阻抗谱（EIS）等。此外，可以有效地抑制磁滞行为，并显着提高稳定性。这项工作可能为钙钛矿型太阳能电池高效ETM的合理设计提供一条新途径。

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