Organic-inorganic hybrid p-i-n heterojunction quantum dot solar cell

Xiaoliang Zhang^a, Erik M. J. Johansson^a

^aDepartment of Chemistry-Ångström, Physical Chemistry, Uppsala University, 75120 Uppsala

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

Poster, Xiaoliang Zhang, 378
Publication date: 5th February 2015

Colloidal quantum dots (QDs) have attracted considerable attention in photovoltaic devices due to their size-dependent optical, electronic, and optoelectronic properties. Depletion region formed at junction interface plays important role for charge carriers separation and collection in the heterojunction colloidal QD solar cell. Heavily doped p-type poly(3-hexylthiophene-2,5-diyl) (P3HT) was applied as hole transport interlayer between QD film and metal contact electrode, forming organic-inorganic hybrid p-i-n heterojunction architecture. After incorporated P3HT interlayer, an additional heterojunction was introduced at the P3HT/QD film interface resulting in increased depletion region and charge carrier extraction under built-in electronic field. The P3HT interlayer also diminishes the charge carriers recombination at QDs/metal contact electrode interface, leading to increased open-circuit voltage, short-circuit current and electron life time. The solar cell with above p-i-n architecture exhibits a power conversion efficiency of 5.09% at 1 sun of illumination, increased by ~21 % comparing with the solar cell without hole interlayer structure. The solar cell with above p-i-n architecture was also constructed on a flexible plastic substrate to fabricate flexible colloidal QD solar cell (Figure 1). The results show that the solar cell could withstand repeated bending tests and remain ~83% of initial efficiency even after 200 consecutive bending cycles test with a circular diameter of 40 mm. Under the bent state, the flexible QD solar cell also shows high performance. The bending durable QD solar cell has potential toward a lightweight, portable and wearable power source, and also for use on curved surfaces for examples on buildings and vehicles.
Figure 1. Photograph of flexible QD solar cell.
Zhang, X.; Liu, J.; Johansson,E. M.; Nanoscale, 2015, 7, 1454-1462.

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