Iqbal Zafar, Zu Fengshuo, Musiienko Artem, Gutierrez-Partida Emilio, Köbler Hans, Gries Thomas W, Sannino Gennaro V, Canil Laura, Koch Norbert, Stolterfoht Martin, Neher Dieter, Pavone Michele, Muñoz-García Ana Belen, Abate Antonio, Wang Qiong
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH. Hahn-Meitner-Platz 1, 14109 Berlin, Germany.
Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany.
ACS Energy Lett. 2023 Sep 22;8(10):4304-4314. doi: 10.1021/acsenergylett.3c01522. eCollection 2023 Oct 13.
In perovskite solar cells (PSCs) energy level alignment and charge extraction at the interfaces are the essential factors directly affecting the device performance. In this work, we present a modified interface between all-inorganic CsPbI perovskite and its hole-selective contact (spiro-OMeTAD), realized by the dipole molecule trioctylphosphine oxide (TOPO), to align the energy levels. On a passivated perovskite film, with -octylammonium iodide (OAI), we created an upward surface band-bending at the interface by TOPO treatment. This improved interface by the dipole molecule induces a better energy level alignment and enhances the charge extraction of holes from the perovskite layer to the hole transport material. Consequently, a of 1.2 V and a high-power conversion efficiency (PCE) of over 19% were achieved for inorganic CsPbI perovskite solar cells. Further, to demonstrate the effect of the TOPO dipole molecule, we present a layer-by-layer charge extraction study by a transient surface photovoltage (trSPV) technique accomplished by a charge transport simulation.
在钙钛矿太阳能电池（PSC）中，界面处的能级对准和电荷提取是直接影响器件性能的关键因素。在这项工作中，我们通过偶极分子三辛基氧化膦（TOPO）实现了全无机CsPbI钙钛矿与其空穴选择性接触（螺环-OMeTAD）之间的界面改性，以实现能级对准。在经辛基碘化铵（OAI）钝化的钙钛矿薄膜上，通过TOPO处理在界面处产生了向上的表面能带弯曲。这种由偶极分子改善的界面诱导了更好的能级对准，并增强了从钙钛矿层到空穴传输材料的空穴电荷提取。因此，无机CsPbI钙钛矿太阳能电池实现了1.2 V的开路电压和超过19%的高功率转换效率（PCE）。此外，为了证明TOPO偶极分子的作用，我们通过电荷传输模拟完成的瞬态表面光电压（trSPV）技术进行了逐层电荷提取研究。
