Understanding the energetic losses and photocurrent enhancement in indacenoedithiophene (IDT) based organic solar cells

Nicola Gasparini^a, Derya Baran^a, Tayebeh Ameri^a, Christoph Brabec^a, Michelle Vezie^b, Jenny Nelson^b, Bob Schroeder^c, Iain McCulloch^c, Thomas Kirchartz^d

^aInstitute of Materials for Electronics and Energy Technology (i-MEET), Martensstr. 7, Erlangen, 91058, Germany

^bForschungszentrum Juelich GmbH, 52425 Juelich

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Derya Baran, presentation 188
Publication date: 5th February 2015

Minimizing the difference between maximum attainable open circuit voltage (V_oc,rad) (where all the recombination is radiative) and the open circuit voltage will bring the OPV devices to its radiative limit.¹ Furthermore, strategies to simultaneously increase the short circuit current (J_sc) of BHJ solar cells will result in high efficiency solar cells. Understanding on the reduced non-radiative recombination paths and strategies to simultaneously increase photocurrent generation will determine the upper limits of OPV technology. In this report, we describe the role of material purification on energetic losses and photocurrent enhancement in high efficiency indacenodithiophen-co-benzothiadiazole (IDTBT): PC₇₀BM bulk-heterojunction (BHJ) solar cells. We investigate the reciprocity relation between photovoltaic quantum efficiency and electroluminescence to explain the reduced energetic losses in highly purified IDTBT-HMw: PC₇₀BM solar cells. In addition, we explain the photocurrent enhancement from non-purified to highly purified IDTBT: PC₇₀BM solar cells by combining electroluminescence spectroscopy (EL), fourier transform photocurrent spectroscopy (FTPS), photo-induced charge carrier extraction by linearly increasing voltage technique (photo-CELIV) and transient photovoltage (TPV) measurements. Highly purified IDTBT-HMw system exhibited reduced non-radiative recombination and higher photocurrent generation among its analogues mainly due to higher electroluminescence emission yield, improved mobility and charge carrier concentration.

(1) Tvingstedt, K.; Malinkiewicz, O.; Baumann, A.; Deibel, C.; Snaith, H. J.; Dyakonov, V.; Bolink, H. J. Sci. Rep. 2014, 4.

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