Efficient Infrared Solar Cells Employing Quantum Dot Solids with Strong Inter-Dot Coupling and Efficient Passivation

Liu Sisi; Zhang Chongjian; Li Shuangyuan; Xia Yong; Wang Kang; Xiong Kao; Tang Haodong; Lian Linyuan; Liu Xinxing; Li Ming-Yu; Tan Manlin; Gao Liang; Niu Guangda; Liu Huan; Song Haisheng; Zhang Daoli; Gao Jianbo; Lan Xinzheng; Wang Kai; Sun Xiao Wei; Yang Ye; Tang Jiang; Zhang Jianbing

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Efficient Infrared Solar Cells Employing Quantum Dot Solids with Strong Inter-Dot Coupling and Efficient Passivation

机译：高效的红外太阳能电池采用量子点固体，具有强烈的点间耦合和有效的钝化

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Lead chalcogenide quantum dot (QD) infrared (IR) solar cells are promising devices for breaking through the theoretical efficiency limit of single-junction solar cells by harvesting the low-energy IR photons that cannot be utilized by common devices. However, the device performance of QD IR photovoltaic is limited by the restrictive relation between open-circuit voltages (V-OC) and short circuit current densities (J(SC)), caused by the contradiction between surface passivation and electronic coupling of QD solids. Here, a strategy is developed to decouple this restriction via epitaxially coating a thin PbS shell over the PbSe QDs (PbSe/PbS QDs) combined with in situ halide passivation. The strong electronic coupling from the PbSe core gives rise to significant carrier delocalization, which guarantees effective carrier transport. Benefited from the protection of PbS shell and in situ halide passivation, excellent trap-state control of QDs is eventually achieved after the ligand exchange. By a fine control of the PbS shell thickness, outstanding IR J(SC) of 6.38 mA cm(-2) and IR V-OC of 0.347 V are simultaneously achieved under the 1100 nm-filtered solar illumination, providing a new route to unfreeze the trade-off between V-OC and J(SC) limited by the photoactive layer with a given bandgap.

机译：铅硫属化物量子点（QD）红外（IR）太阳能电池是通过收获不能通过普通器件使用的低能量红外光子来破坏单结太阳能电池的理论效率极限的有希望的装置。然而，QD IR光伏的器件性能受开路电压（V-OC）和短路电流密度（J（SC）之间的限制关系（J（SC））的限制，由QD固体的表面钝化和电子耦合之间的矛盾引起。这里，开发了一种策略以通过外延涂覆薄的PBS壳在PBSE QDS（PBSE / PBS QD）上与原位卤化物钝化结合而被外延涂覆这种限制。来自PBSE核心的强电子耦合产生了显着的载体临床化，可确保有效的载体运输。受益于保护PBS壳和原位卤化物钝化，在配体交换后最终实现了QDS的优异陷阱控制。通过对PBS壳厚度的精细控制，在1100nm过滤的太阳能照明下同时实现了6.38 mA cm（-2）和IR V-OC的优秀IR j（sc），同时实现了0.347 V的IR V-OC，为解冻提供了新的路线由给定带隙的光活性层限制的V-OC和J（SC）之间的权衡。

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来源
《Advanced Functional Materials》 |2021年第9期|2006864.1-2006864.8|共8页
作者
Liu Sisi; Zhang Chongjian; Li Shuangyuan; Xia Yong; Wang Kang; Xiong Kao; Tang Haodong; Lian Linyuan; Liu Xinxing; Li Ming-Yu; Tan Manlin; Gao Liang; Niu Guangda; Liu Huan; Song Haisheng; Zhang Daoli; Gao Jianbo; Lan Xinzheng; Wang Kai; Sun Xiao Wei; Yang Ye; Tang Jiang; Zhang Jianbing;
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Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Xiamen Univ Coll Chem & Chem Engn State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China;

Xiamen Univ Coll Chem & Chem Engn State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Southern Univ Sci & Technol Guangdong Univ Key Lab Adv Quantum Dot Displays & Dept Elect & Elect Engn Shenzhen Key Lab Adv Quantum Dot Displays & Light Shenzhen 518055 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China;

Wuhan Univ Technol Sch Sci Wuhan 430070 Peoples R China;

Tsinghua Univ Shenzhen Res Inst Shenzhen 518057 Peoples R China;

Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Clemson Univ Dept Phys & Astron Ultrafast Photophys Quantum Devices Clemson SC 29634 USA;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China;

Southern Univ Sci & Technol Guangdong Univ Key Lab Adv Quantum Dot Displays & Dept Elect & Elect Engn Shenzhen Key Lab Adv Quantum Dot Displays & Light Shenzhen 518055 Peoples R China;

Southern Univ Sci & Technol Guangdong Univ Key Lab Adv Quantum Dot Displays & Dept Elect & Elect Engn Shenzhen Key Lab Adv Quantum Dot Displays & Light Shenzhen 518055 Peoples R China;

Xiamen Univ Coll Chem & Chem Engn State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China;

Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China;

Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China;

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正文语种 eng
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关键词
infrared solar cells; inter#8208; dot coupling; PbSe; PbSe; PbS core; shell; quantum dots;

机译：红外太阳能电池;点间耦合;PBSE;PBSE;PBS核心;壳;量子点;

Efficient Infrared Solar Cells Employing Quantum Dot Solids with Strong Inter-Dot Coupling and Efficient Passivation

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