Yavari Mozhgan, Mazloum-Ardakani Mohammad, Gholipour Somayeh, Tavakoli Mohammad Mahdi, Taghavinia Nima, Hagfeldt Anders, Tress Wolfgang
Laboratory of Photomolecular Science, École Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.
Department of Chemistry, Yazd University, 89195-741 Yazd, Iran.
ACS Omega. 2018 May 9;3(5):5038-5043. doi: 10.1021/acsomega.8b00555. eCollection 2018 May 31.
Identifying and reducing the dominant recombination processes in perovskite solar cells is one of the major challenges for further device optimization. Here, we show that introducing a thin interlayer of poly(4-vinylpyridine) (PVP) between the perovskite film and the hole transport layer reduces nonradiative recombination. Employing such a PVP interlayer, we reach an open-circuit voltage of 1.20 V for the best devices and a stabilized efficiency of 20.7%. The beneficial effect of the PVP interlayer is proven by statistical analysis of various samples, many of those showing an open-circuit voltage larger than 1.17 V, and a 30 mV increase in average compared to unmodified samples. The reduced nonradiative recombination is proven by enhanced photo- and electroluminescence yields.
识别并减少钙钛矿太阳能电池中的主要复合过程是进一步优化器件的主要挑战之一。在此，我们表明在钙钛矿薄膜和空穴传输层之间引入一层薄的聚（4-乙烯基吡啶）（PVP）中间层可减少非辐射复合。采用这种PVP中间层，我们制备的最佳器件开路电压达到1.20 V，稳定效率为20.7%。通过对各种样品的统计分析证明了PVP中间层的有益效果，其中许多样品的开路电压大于1.17 V，与未改性样品相比平均增加了30 mV。光致发光和电致发光产率的提高证明了非辐射复合的减少。
