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Achieving High Efficiency in Solution-Processed Perovskite Solar Cells Using C60/C70 Mixed Fullerenes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-09-27 00:00:00 , DOI: 10.1021/acsami.8b11049 Hao-Sheng Lin 1 , Il Jeon 1 , Rong Xiang 1 , Seungju Seo 1 , Jin-Wook Lee 2 , Chao Li 2 , Amrita Pal 3 , Sergei Manzhos 3 , Mark S. Goorsky 2 , Yang Yang 2 , Shigeo Maruyama 1 , Yutaka Matsuo 1, 4
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-09-27 00:00:00 , DOI: 10.1021/acsami.8b11049 Hao-Sheng Lin 1 , Il Jeon 1 , Rong Xiang 1 , Seungju Seo 1 , Jin-Wook Lee 2 , Chao Li 2 , Amrita Pal 3 , Sergei Manzhos 3 , Mark S. Goorsky 2 , Yang Yang 2 , Shigeo Maruyama 1 , Yutaka Matsuo 1, 4
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Fullerenes have attracted considerable interest as an electron-transporting layer in perovskite solar cells. Fullerene-based perovskite solar cells produce no hysteresis and do not require high-temperature annealing. However, high power conversion efficiency has been only achieved when the fullerene layer is thermally evaporated, which is an expensive process. In this work, the limitations of a solution-processed fullerene layer have been identified as high crystallinity and the presence of remnant solvents, in contrast to a thermally deposited C60 film, which has low crystallinity and no remaining solvents. As a solution to these problems, a mixed C60 and C70 solution-processed film, which exhibits low crystallinity, is proposed as an electron-transporting layer. The mixed-fullerene-based devices produce power conversion efficiencies as high as that of the thermally evaporated C60-based device (16.7%) owing to improved fill factor and open-circuit voltage. In addition, by vacuum-drying the mixed fullerene film, the power conversion efficiency of the solution-processed perovskite solar cells is further improved to 18.0%. This improvement originates from the enhanced transmittance and charge transport by removing the solvent effect. This simple and low-cost method can be easily used in any type of solar cells with fullerene as the electron-transporting layer.
中文翻译：
使用C 60 / C 70混合富勒烯实现固溶钙钛矿太阳能电池的高效率
作为钙钛矿太阳能电池中的电子传输层，富勒烯引起了极大的兴趣。基于富勒烯的钙钛矿太阳能电池不会产生滞后现象，并且不需要高温退火。然而，仅当富勒烯层被热蒸发时才实现高功率转换效率，这是昂贵的过程。在这项工作中，与热沉积的C 60膜具有低的结晶度且没有残留的溶剂相比，已经确定了溶液处理的富勒烯层的局限性是高结晶度和残余溶剂的存在。为了解决这些问题，混合使用了C 60和C 70提出将具有低结晶度的固溶处理膜用作电子传输层。由于改进的填充因子和开路电压，基于混合富勒烯的器件产生的功率转换效率与基于热蒸发的C 60器件的功率转换效率一样高（16.7％）。另外，通过真空干燥混合的富勒烯膜，溶液处理的钙钛矿型太阳能电池的功率转换效率进一步提高到18.0％。该改进源自通过消除溶剂效应而提高的透射率和电荷传输。这种简单且低成本的方法可以容易地用于具有富勒烯作为电子传输层的任何类型的太阳能电池中。
更新日期：2018-09-27
中文翻译：
使用C 60 / C 70混合富勒烯实现固溶钙钛矿太阳能电池的高效率
作为钙钛矿太阳能电池中的电子传输层，富勒烯引起了极大的兴趣。基于富勒烯的钙钛矿太阳能电池不会产生滞后现象，并且不需要高温退火。然而，仅当富勒烯层被热蒸发时才实现高功率转换效率，这是昂贵的过程。在这项工作中，与热沉积的C 60膜具有低的结晶度且没有残留的溶剂相比，已经确定了溶液处理的富勒烯层的局限性是高结晶度和残余溶剂的存在。为了解决这些问题，混合使用了C 60和C 70提出将具有低结晶度的固溶处理膜用作电子传输层。由于改进的填充因子和开路电压，基于混合富勒烯的器件产生的功率转换效率与基于热蒸发的C 60器件的功率转换效率一样高（16.7％）。另外，通过真空干燥混合的富勒烯膜，溶液处理的钙钛矿型太阳能电池的功率转换效率进一步提高到18.0％。该改进源自通过消除溶剂效应而提高的透射率和电荷传输。这种简单且低成本的方法可以容易地用于具有富勒烯作为电子传输层的任何类型的太阳能电池中。
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