Details

Autor(en) / Beteiligte

• Rong, Yaoguang
• Hu, Yue
• Ravishankar, Sandheep
• Liu, Huawei
• Hou, Xiaomeng
• Sheng, Yusong
• Mei, Anyi
• Wang, Qifei
• Li, Daiyu
• Xu, Mi
• Bisquert, Juan
• Han, Hongwei

Titel

Tunable hysteresis effect for perovskite solar cells

Ist Teil von

• Energy & environmental science, 2017-01, Vol.10 (11), p.2383-2391

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Perovskite solar cells (PSCs) usually suffer from a hysteresis effect in current–voltage measurements, which leads to an inaccurate estimation of the device efficiency. Although ion migration, charge trapping/detrapping, and accumulation have been proposed as a basis for the hysteresis, the origin of the hysteresis has not been apparently unraveled. Herein we reported a tunable hysteresis effect based uniquely on open-circuit voltage variations in printable mesoscopic PSCs with a simplified triple-layer TiO 2 /ZrO 2 /carbon architecture. The electrons are collected by the compact TiO 2 /mesoporous TiO 2 (c-TiO 2 /mp-TiO 2 ) bilayer, and the holes are collected by the carbon layer. By adjusting the spray deposition cycles for the c-TiO 2 layer and UV-ozone treatment, we achieved hysteresis-normal, hysteresis-free, and hysteresis-inverted PSCs. Such unique trends of tunable hysteresis are analyzed by considering the polarization of the TiO 2 /perovskite interface, which can accumulate positive charges reversibly. Successfully tuning of the hysteresis effect clarifies the critical importance of the c-TiO 2 /perovskite interface in controlling the hysteretic trends observed, providing important insights towards the understanding of this rapidly developing photovoltaic technology.