Thermally stable, planar hybrid perovskite solar cells with high efficiency†,Energy & Environmental Science

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Thermally stable, planar hybrid perovskite solar cells with high efficiency†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-08-21 00:00:00 , DOI: 10.1039/c8ee02242a
Kyoungwon Choi _{1,

2,

3,

4} , Junwoo Lee _{1,

2,

3,

4} , Hong Il Kim _{1,

2,

3,

4} , Cheol Woong Park _{1,

2,

3,

4} , Guan-Woo Kim _{1,

2,

3,

4} , Hyuntae Choi _{1,

2,

3,

4} , Sungjin Park _{1,

2,

3,

4} , Sang Ah Park _{1,

2,

3,

4} , Taiho Park _{1,

2,

3,

4}

Affiliation

We report a highly effective interface engineering strategy for thermally stable perovskite solar cells (PSCs) by employing a zwitterion-modified SnO₂ electron transport layer (ETL) and a dopant-free hole transport layer (HTL). A zwitterionic compound, 3-(1-pyridinio)-1-propanesulfonate, is used to modify the SnO₂ ETL. The zwitterion, which forms interfacial dipoles, plays a few important roles: (1) it causes shifts in the work function of SnO₂ resulting in more efficient charge extraction and an increase in the built-in potential. (2) It pulls electrons from perovskite layers to the ETL/perovskite interface, enhancing the electron transport ability. (3) Interfacial dipoles prevent back transfer of electrons from the ETL to the perovskite and suppress charge recombination. (4) Positively charged atoms in the zwitterion passivate Pb–I antisite defects, improving the stability of devices. With these desirable properties, the PSC with doped Spiro-OMeTAD obtained a power conversion efficiency of 21.43%. In addition, the PSC with the dopant-free HTL exhibited a record high efficiency of 20.5% among dopant-free polymeric HTLs using green solvents. The resulting PSCs without encapsulation showed excellent thermal stability. Accordingly, this work suggests that the use of a modified ETL and a dopant-free HTL is a promising strategy to overcome the thermal instability of planar-PSCs (P-PSCs).

中文翻译：

高效热稳定的平面混合钙钛矿太阳能电池†

我们通过采用两性离子改性的SnO ₂电子传输层（ETL）和无掺杂空穴传输层（HTL）报告了热稳定钙钛矿太阳能电池（PSC）的高效界面工程策略。两性离子化合物3-（1-吡啶基）-1-丙烷磺酸盐用于修饰SnO ₂ ETL。形成界面偶极子的两性离子起着一些重要作用：（1）它引起SnO ₂的功函数偏移。导致更有效的电荷提取和内置电势的增加。（2）它将电子从钙钛矿层拉至ETL /钙钛矿界面，从而增强了电子传输能力。（3）界面偶极子可防止电子从ETL向钙钛矿的反向转移并抑制电荷复合。（4）两性离子中带正电的原子钝化了Pb–I的反位缺陷，从而提高了器件的稳定性。具有这些理想的特性，掺有Spiro-OMeTAD的PSC的功率转换效率为21.43％。此外，在使用绿色溶剂的无掺杂聚合物HTL中，具有无掺杂剂HTL的PSC表现出创纪录的20.5％的高效率。所得的没有封装的PSC表现出优异的热稳定性。因此，

更新日期：2018-08-21

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