Reducing Voltage Losses in Cascade Organic Solar Cells while Maintaining High External Quantum Efficiencies

被引:127
作者
Nikolis, Vasileios C. [1 ,2 ]
Benduhn, Johannes [1 ,2 ]
Holzmueller, Felix [1 ,2 ]
Piersimoni, Fortunato [3 ]
Lau, Matthias [1 ,2 ]
Zeika, Olaf [1 ,2 ]
Neher, Dieter [3 ]
Koerner, Christian [1 ,2 ]
Spoltore, Donato [1 ,2 ]
Vandewal, Koen [1 ,2 ]
机构
[1] Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany
[2] Tech Univ Dresden, Inst Appl Phys, Nothnitzer Str 61, D-01187 Dresden, Germany
[3] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany
关键词
energy losses; nonradiative recombination; open-circuit voltage; organic solar cells; voltage losses; OPEN-CIRCUIT VOLTAGE; NON-FULLERENE ACCEPTOR; BAND-GAP POLYMER; SMALL-MOLECULE; ENERGY-LOSSES; 11-PERCENT EFFICIENCY; FILL FACTOR; DONOR; STATES;
D O I
10.1002/aenm.201700855
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
High photon energy losses limit the open-circuit voltage (V-OC) and power conversion efficiency of organic solar cells (OSCs). In this work, an optimization route is presented which increases the V-OC by reducing the interfacial area between donor (D) and acceptor (A). This optimization route concerns a cascade device architecture in which the introduction of discontinuous interlayers between alpha-sexithiophene (alpha-6T) (D) and chloroboron subnaphthalocyanine (SubNc) (A) increases the V-OC of an alpha-6T/SubNc/SubPc fullerene-free cascade OSC from 0.98 V to 1.16 V. This increase of 0.18 V is attributed solely to the suppression of nonradiative recombination at the D-A interface. By accurately measuring the optical gap (E-opt) and the energy of the charge-transfer state (E-CT) of the studied OSC, a detailed analysis of the overall voltage losses is performed. E-opt - qV(OC) losses of 0.58 eV, which are among the lowest observed for OSCs, are obtained. Most importantly, for the V-OC-optimized devices, the low-energy (700 nm) external quantum efficiency (EQE) peak remains high at 79%, despite a minimal driving force for charge separation of less than 10 meV. This work shows that low-voltage losses can be combined with a high EQE in organic photovoltaic devices.
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页数:8
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