Highly stable carbon-based perovskite solar cell with a record efficiency of over 18% via hole transport engineering
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第6期
论文作者：Qian-Qian Chu Bin Ding Jun Peng Heping Shen Xiaolei Li Yan Liu Cheng-Xin Li Chang-Jiu Li Guan-Jun Yang Thomas P.White Kylie R.Catchpole
文章页码：987 - 993
摘 要：Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in air, compared to their counterparts using metal contacts. The photovoltaic performance of carbon-based PSCs, however, has been progressing slowly in spite of an impressive efficiency when they were first reported. One of the major obstacles is that the hole transport materials developed for stateof-the-art Au-based PSCs are not suitable for carbon-based PSCs. Here, we develop a low-temperature,solution-processed Poly（3-hexylthiophene-2,5-diyl）（P3 HT）/graphene composite hole transport layer（HTL）, that is compatible with paintable carbon-electrodes to produce state-of-the-art perovskite devices. Space-charge-limited-current measurements reveal that the as-prepared P3 HT/graphene composite exhibits outstanding charge mobility and thermal tolerance, with hole mobility increasing from8.3 × 10-3 cm2 V-1 s-1（as-deposited） to 1.2 × 10-2 cm2 V-1 s-1（after annealing at 100°C）-two orders of magnitude larger than pure P3 HT. The improved charge transport and extraction provided by the composite HTL provides a significant efficiency improvement compared to cells with a pure P3 HT HTL. As a result, we report carbon-based solar cells with a record efficiency of 17.8%（certified by Newport）; and the first perovskite cells to be certified under the stabilized testing protocol. The outstanding device stability is demonstrated by only 3% drop after storage in ambient conditions（humidity: ca. 50%） for 1680 h（nonencapsulated）, and retention of ca. 89% of their original output under continuous 1-Sun illumination at room-temperature for 600 h（encapsulated） in a nitrogen environment.
Qian-Qian Chu，Bin Ding，Jun Peng，Heping Shen，Xiaolei Li，Yan Liu，Cheng-Xin Li，Chang-Jiu Li，Guan-Jun Yang，Thomas P.White，Kylie R.Catchpole
摘 要：Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in air, compared to their counterparts using metal contacts. The photovoltaic performance of carbon-based PSCs, however, has been progressing slowly in spite of an impressive efficiency when they were first reported. One of the major obstacles is that the hole transport materials developed for stateof-the-art Au-based PSCs are not suitable for carbon-based PSCs. Here, we develop a low-temperature,solution-processed Poly（3-hexylthiophene-2,5-diyl）（P3 HT）/graphene composite hole transport layer（HTL）, that is compatible with paintable carbon-electrodes to produce state-of-the-art perovskite devices. Space-charge-limited-current measurements reveal that the as-prepared P3 HT/graphene composite exhibits outstanding charge mobility and thermal tolerance, with hole mobility increasing from8.3 × 10-3 cm2 V-1 s-1（as-deposited） to 1.2 × 10-2 cm2 V-1 s-1（after annealing at 100°C）-two orders of magnitude larger than pure P3 HT. The improved charge transport and extraction provided by the composite HTL provides a significant efficiency improvement compared to cells with a pure P3 HT HTL. As a result, we report carbon-based solar cells with a record efficiency of 17.8%（certified by Newport）; and the first perovskite cells to be certified under the stabilized testing protocol. The outstanding device stability is demonstrated by only 3% drop after storage in ambient conditions（humidity: ca. 50%） for 1680 h（nonencapsulated）, and retention of ca. 89% of their original output under continuous 1-Sun illumination at room-temperature for 600 h（encapsulated） in a nitrogen environment.
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