Voltage output of efficient perovskite solar cells with high open-circuit voltage and fill factor

Seungchan Ryu, Jun Hong Noh, Nam Joong Jeon, Young Chan Kim, Woon Seok Yang, Jangwon Seo, Sang Il Seok

Research output: Contribution to journalArticle

525 Citations (Scopus)

Abstract

Besides the generated photocurrent as a key factor that impacts the efficiency of solar cells, the produced photovoltage and fill factor are also of critical importance. Therefore, understanding and optimization of the open-circuit voltage (V oc ) of perovskite solar cells, especially with an architecture consisting of mesoporous (mp)-TiO 2 /perovskite/hole transporting materials (HTMs), are required to further improve the conversion efficiency. In this work, we study the effects of the energy level between CH 3 NH 3 (= MA)PbI 3 and MAPbBr 3 and a series of triarylamine polymer derivatives containing fluorene and indenofluorene, which have different highest occupied molecular orbital (HOMO) levels, in terms of the photovoltaic behaviour. The voltage output of the device is found to be dependent on the higher energy level of perovskite solar absorbers as well as the HOMO level of the HTMs. The combination of MAPbBr 3 and a deep-HOMO HTM leads to a high photovoltage of 1.40 V, with a fill factor of 79% and an energy conversion efficiency of up to 6.7%, which is the highest value reported to date for MAPbBr 3 perovskite solar cells. This journal is

Original languageEnglish
Pages (from-to)2614-2618
Number of pages5
JournalEnergy and Environmental Science
Volume7
Issue number8
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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