背接觸式鈣鈦礦太陽能電池發展現況

Development status of back-contact perovskite solar cells

鹵化物鈣鈦礦太陽能電池(halide-based perovskite solar cells)因其卓越的光電轉換效率，己成為目前光伏技術研究的焦點之一。然而，其疊層(layer stacking)的三明治結構限制了入射光進入鈣鈦礦吸光層的強度。背接觸式電極結構被認為能進一步提升光電轉換效率，這種結構的主要特點是將所有載子傳輸層及電極置於鈣鈦礦吸光層下方，使鈣鈦礦吸光層作為入光面減少光學損耗。本文主要回顧了背接觸式鈣鈦礦太陽能電池的發展與製作，此種新型結構有望使元件比三明治結構的元件具有更高的光電轉換效率。

Halide-based perovskite solar cells (PSCs) have emerged as one of the most attractive photovoltaic technologies owing to their remarkable power conversion efficiency (PCE). However, the conventional layer-stacking sandwich structure of PSCs limits the intensity of incident light reaching the perovskite light absorber. Back-contact perovskite solar cells (BC-PSCs) are anticipated to further enhance PCE. In this structure, all carrier transport layers and electrodes are fabricated beneath the perovskite light absorber, allowing the incident light to directly illuminate the perovskite light absorber and reducing optical loss. This article briefly reviews the development and fabrication of BC-PSCs, with this innovative structure expected to offer higher PCE compared to the sandwich-type configuration.