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Andrew B. Holmes presents Recent progress in thin film organic and perovskite photovoltaic devices In recent years tremendous progress has been achieved in the design and fabrication of thin film organic and perovskite photovoltaic devices. The organic devices consist of a bulk heterojunction interface con-sisting of donor and acceptor molecular or polymeric materials at which the charge separation process (from the excitonic state) usually occurs. The donor and acceptor materials are also required to exhibit sufficient charge carrier mobilities that allow the charges to be transported to the relevant electrodes before charge recombination can occur at the interface. Perovskite devices consist of an active layer of a material of general formula ABX3 in which the A component is typically a positively charged species such as Me2NH2+, HCOONH2+, or Cs+, while the B component is typically Pb(II) or Sn(II), and the X component is typically I- or a combination of halide ions. Upon photoexcitation, the lifetime of the excited state is sufficiently long to enable charge separation and the positive charge can then be extracted with the aid of a hole transporting layer (typically a spirocyclic triarylamine species such as OMeTAD) to the cathode, and an n-type material can assist transport of the negative charges to the anode. Perovskite devices have often been used in a tandem cell with a silicon device in order to harness the short wavelength radiation that silicon cannot absorb. In this presentation, progress in the development of both solution-deposited organic and perovskite thin film devices will be summarised, with a description of the champion efficiency properties being reported for both small and large area devices.