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Unraveling the Dual-Functional Mechanism of Light Absorption and Hole Transport of Cu2CdxZn1–xSnS4 for Achieving Efficient and Stable Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsami.0c00607 Yanjie Wu 1 , Wenbo Bi 1 , Zhichong Shi 1 , Xinmeng Zhuang 1 , Zonglong Song 1 , Shuainan Liu 1 , Cong Chen 1 , Lin Xu 1 , Qilin Dai 2 , Hongwei Song 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsami.0c00607 Yanjie Wu 1 , Wenbo Bi 1 , Zhichong Shi 1 , Xinmeng Zhuang 1 , Zonglong Song 1 , Shuainan Liu 1 , Cong Chen 1 , Lin Xu 1 , Qilin Dai 2 , Hongwei Song 1
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Broadening the near-infrared (NIR) spectrum of device is critical to further improve the power conversion efficiency (PCE) of the perovskite solar cells (PSCs). In this work, novel Cu2CdZn1–xSnS4 (CZTS:Cd) film prepared by thermal evaporation method was employed as the NIR light-harvesting layer to complement the absorption of the perovskite. At the same time, Au nanorods (NRs) were introduced into the hole-transporting layer (HTL) to boost the utilization of CZTS:Cd to NIR light through localized surface plasmon effect. The perovskite/CZTS:Cd and Au NR-integrated PSCs can extend the photoelectric response to 900 nm. And more, the well-matched energy levels between CZTS:Cd and perovskite can effectively extract holes from perovskite and depress the charge carrier recombination. As a result, the champion PSC device insulating with CZTS:Cd and Au NRs demonstrates a remarkably increased PCE from 19.30 to 21.11%. The modified PSC devices also demonstrate highly improved long-time stability. The device retains a PCE of 87% after 500 h even under air with a relative humidity of 85%, implying the superior humidity stability of the devices with CZTS:Cd. This work suggests that perovskite/inorganic-integrated structure is a promising strategy to broaden and boost the NIR response of the PSCs.
中文翻译：
揭示光吸收和空穴传输Cu 2 Cd x Zn 1– x SnS 4的双重功能机理，以实现高效稳定的钙钛矿太阳能电池
扩大器件的近红外（NIR）光谱对于进一步提高钙钛矿太阳能电池（PSC）的功率转换效率（PCE）至关重要。在这项工作中，新颖的Cu 2 CdZn 1– x SnS 4通过热蒸发法制备的（CZTS：Cd）膜用作NIR光收集层，以补充钙钛矿的吸收。同时，将金纳米棒（NRs）引入空穴传输层（HTL），以通过局部表面等离子体激元效应提高CZTS：Cd在近红外光中的利用率。钙钛矿/ CZTS：Cd和Au NR集成的PSC可以将光电响应扩展到900 nm。而且，CZTS：Cd和钙钛矿之间的能级匹配可以有效地从钙钛矿中提取空穴并抑制载流子复合。结果，与CZTS：Cd和Au NRs绝缘的冠军PSC器件显示PCE显着提高，从19.30％增至21.11％。改进的PSC器件还显示出高度改善的长期稳定性。即使在空气中相对湿度为85％的情况下，该器件在500小时后仍保持87％的PCE，这意味着具有CZTS：Cd的器件具有出色的湿度稳定性。这项工作表明钙钛矿/无机一体化结构是扩大和增强PSC的近红外响应的有前途的策略。
更新日期：2020-04-01
中文翻译：
揭示光吸收和空穴传输Cu 2 Cd x Zn 1– x SnS 4的双重功能机理，以实现高效稳定的钙钛矿太阳能电池
扩大器件的近红外（NIR）光谱对于进一步提高钙钛矿太阳能电池（PSC）的功率转换效率（PCE）至关重要。在这项工作中，新颖的Cu 2 CdZn 1– x SnS 4通过热蒸发法制备的（CZTS：Cd）膜用作NIR光收集层，以补充钙钛矿的吸收。同时，将金纳米棒（NRs）引入空穴传输层（HTL），以通过局部表面等离子体激元效应提高CZTS：Cd在近红外光中的利用率。钙钛矿/ CZTS：Cd和Au NR集成的PSC可以将光电响应扩展到900 nm。而且，CZTS：Cd和钙钛矿之间的能级匹配可以有效地从钙钛矿中提取空穴并抑制载流子复合。结果，与CZTS：Cd和Au NRs绝缘的冠军PSC器件显示PCE显着提高，从19.30％增至21.11％。改进的PSC器件还显示出高度改善的长期稳定性。即使在空气中相对湿度为85％的情况下，该器件在500小时后仍保持87％的PCE，这意味着具有CZTS：Cd的器件具有出色的湿度稳定性。这项工作表明钙钛矿/无机一体化结构是扩大和增强PSC的近红外响应的有前途的策略。
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