Charge Generation and Recombination in an Organic Solar Cell with Low Energetic Offsets

Ran, Niva A.; Love, John A.; Heiber, Michael C.; Jiao, Xuechen; Hughes, Michael P.; Karki, Akchheta; Wang, Ming; Brus, Viktor V.; Wang, Hengbin; Neher, Dieter; Ade, Harald; Bazan, Guillermo C.; Nguyen, Thuc‐Quyen

doi:10.1002/aenm.201701073

Charge Generation and Recombination in an Organic Solar Cell with Low Energetic Offsets

Journal Article · Wed Oct 11 00:00:00 EDT 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201701073· OSTI ID:1399050

^[1]; Love, John A. ^[2]; Heiber, Michael C. ^[1]; Jiao, Xuechen ^[3]; Hughes, Michael P. ^[1]; Karki, Akchheta ^[1]; Wang, Ming ^[1]; Brus, Viktor V. ^[4]; Wang, Hengbin ^[5]; Neher, Dieter ^[6]; Ade, Harald ^[3]; Bazan, Guillermo C. ^[1]; Nguyen, Thuc‐Quyen ^[1]

Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA, Institute of Physics and Astronomy University of Potsdam 14476 Potsdam Germany
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA, Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Institut für Silizium Photovoltaik Kekuléstr. 5 12489 Berlin Germany
Mitsubishi Chemical Center for Advanced Materials University of California Santa Barbara CA 93106 USA
Institute of Physics and Astronomy University of Potsdam 14476 Potsdam Germany

Abstract

Organic bulk heterojunction (BHJ) solar cells require energetic offsets between the donor and acceptor to obtain high short‐circuit currents ( J _SC ) and fill factors ( FF ). However, it is necessary to reduce the energetic offsets to achieve high open‐circuit voltages ( V _OC ). Recently, reports have highlighted BHJ blends that are pushing at the accepted limits of energetic offsets necessary for high efficiency. Unfortunately, most of these BHJs have modest FF values. How the energetic offset impacts the solar cell characteristics thus remains poorly understood. Here, a comprehensive characterization of the losses in a polymer:fullerene BHJ blend, PIPCP:phenyl‐C61‐butyric acid methyl ester (PC ₆₁ BM), that achieves a high V _OC (0.9 V) with very low energy losses ( E _loss = 0.52 eV) from the energy of absorbed photons, a respectable J _SC (13 mA cm ⁻² ), but a limited FF (54%) is reported. Despite the low energetic offset, the system does not suffer from field‐dependent generation and instead it is characterized by very fast nongeminate recombination and the presence of shallow traps. The charge‐carrier losses are attributed to suboptimal morphology due to high miscibility between PIPCP and PC ₆₁ BM. These results hold promise that given the appropriate morphology, the J _SC , V _OC , and FF can all be improved, even with very low energetic offsets.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1399050

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 5 Vol. 8; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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