Can the efficiencies of simplified perovskite solar cells go higher?

• 作者: Jin-Feng Liao Wenhuai Feng Jun-Xing Zhong Bing-Xin Lei Wu-Qiang Wu
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（7）
• 页码范围: 33-36
• 页数: 4页
• 语种: 英文

摘要

In recent years, metal halide perovskites have emerged as star semiconducting materials in the field of optoelectronic devices owing to their fascinating optoelectronic properties.Of particular interest are perovskite solar cells (PSCs), which have witnessed skyrocketing power conversion efficiencies (PCEs) within a short period of time, and were recently certified to reach 25.5％, which is already higher than other thin film photovoltaic technologies [1].Nevertheless, multiple layers are still needed for state-of-the-art PSCs to achieve high PCEs over 21％.In general, the perovskite layer is sandwiched between the electron transport layer (ETL) and hole transport layer (HTL).Such multiple layer coating is energy-and time-consuming, also some of the charge transport materials are very expensive, despite perovskite materials being cheap.Even worse, some charge transport materials, e.g.titanium dioxide (TiO2), nickel oxides (NiOx) and poly(3,4-ethylenedioxythio phene)-poly(styrenesulfonate) (PEDOT∶PSS) are criticized for incurring instability issue in PSCs.Contrastingly, the intrinsic ambipolar charge transport characteristic of halide perovskite materials endows them with great potential to simultaneously function as a light harvesting layer and a charge transport layer (CTL).In view of this, intensive research has been focused on simplifying the device architecture via constructing CTL-free PSCs.